Edited by Giray SADIK  

According to Strategic Concept 2022, terrorism, which poses the immediate asymmetric and transnational threat, is one of two main threats to NATO. Even though NATO’s focus is currently directed to the other main threat, Russia, particularly after its war against Ukraine, terrorism has remained a major threat across the NATO territory and periphery. Besides, the adaptations of terrorist organizations in response to current wars such as the one in Ukraine are likely to exacerbate terrorist threats for NATO Allies and partners. Therefore, there is an ongoing need for research and learning around global terrorism landscape and its implications for NATO. To this end, this research aims to identify the lessons learned for NATO from the RussiaUkraine war for countering terrorism effectively. Russia’s war on Ukraine since February 2022 has led to dramatic changes in global geopolitics and the all-encompassing domains of security, connectivity, and modern warfare. Although significant and widespread, the effects of this ongoing war on global terrorism have yet to be comprehensively analyzed. To address this gap in a timely manner, this project aims to examine the effects of the Russia-Ukraine war on terrorism through expert discussions on the contemporary trends and lessons learned for global counter-terrorism efforts, and NATO Allies and Partners. To this end, we organized a workshop in hybrid format (in-person and online) with the contributing authors of the edited book. Workshop participants include academics, practitioners, and subject matter experts from various NATO Allies and Partners.   

Ankara, Turkey: Centre of Excellence Defence Against Terrorism (COE-DAT) , 2025.   138p.

By Shai Farber

  This systematic review unveils significant convergence between cybercriminals and terrorists over the past decade, characterized by substantial overlap in tactics, capabilities, and infrastructure exploitation. Key findings illuminate the adoption of cybercriminal methods by terrorist organizations, the engagement of cybercriminal groups in terrorist activities, the proliferation of enabling technologies such as cryptocurrencies and the dark web, and the role of social media in facilitating knowledge exchange between diverse threat actors. While direct terrorist involvement in proftdriven cybercrime appears limited, the escalating convergence underscores urgent imperatives for enhanced cooperation, legal refinement, the establishment of flexible counter-threat authorities, and collaboration with the private sector. Continuous monitoring of this rapidly evolving landscape is crucial to inform effective policies and interventions in an increasingly interconnected digital world.

Security Journal (2025), 23p.

By Nina Wilén and Kwesi Aning

Over the past decade, Western and multilateral security interventions in the Sahel have failed to stabilize the region, while national and local efforts, particularly in Mali and Burkina Faso, have remained largely militarized. These approaches have proven ineffective in addressing the underlying causes of instability, such as food insecurity, lack of basic services, and limited economic opportunities. The key lesson learned is that military action alone cannot resolve the Sahel’s security crisis—political engagement from local, national, and regional actors is crucial.

Konrad-Adenauer-Stiftung e. V. 2 COUNTER EXTREMISM PROJECT, 2025// 28p.

By Alex Nowraster

A total of 298 mass shooters were responsible for 1,733 murders and 2,459 people injured in the United States from 1966 through the end of 2024. Over the 59 years studied here, the chance of being murdered by a mass shooter was about 1 in 9.1 million per year, and the annual chance of being injured was about 1 in 6.4 million. The murder victims of mass shooters account for about 0.15 percent of all homicides from 1966 through the end of 2024, but that percentage has risen in recent years. The deadliest year for mass shootings was 2017, when 14 shooters murdered 130 people and injured 959 others, accounting for 0.7 percent of all homicides in that year. Of those 298 shooters, 255 were native-born and 43 were foreign-born. The chance of being murdered in a mass shooting committed by a native-born American was about 1 in 10.5 million per year, about 6.5 times higher than the chance of being killed by a foreign-born mass shooter, which was about 1 in 68.4 million per year. The annual chance of being injured by a foreign-born mass shooter was about 1 in 94.7 million, and the chance of being injured by a native-born shooter was about 1 in 6.9 million per year. About 14.4 percent of mass shooters were foreign born, and they were responsible for 13.3 percent of murders, roughly in line with their share of the population, and 6.8 percent of injuries in mass shootings, roughly half their share of the population.

Washington, DC: Cato Institute, 2025. 10p.

By Jacob D. Charles

Gun violence is a pressing national concern. And it has been for decades. Throughout nearly all that time, the primary tool lawmakers have deployed to stanch the violence has been the machinery of the criminal law. Increased policing, intrusive surveillance, vigorous prosecution, and punitive penalties are showered on gun offenders. This Article spotlights and specifies this approach—what it calls “firearms carceralism”—and details how a decades-long bipartisan consensus generated a set of state-centered solutions to gun violence that has not meaningfully impacted the problem. Instead, those policies have exacerbated racial inequity and compounded civic and community harms. The Article traces the escalating punitive measures imposed on gun offenders over the past half century. It first peers down into one microcosmic exemplar of firearms carceralism etched into federal mandatory minimum provisions and Supreme Court case law magnifying those penalties. It describes how criminal justice reforms have traditionally excluded those whose offenses are categorized as violent, and specifically and emphatically 2812 MINNESOTA LAW REVIEW [108:2811 those who offend with guns by their side. It then draws out promising hints of a path to including gun offenders in efforts to reform or reimagine the criminal legal system. Most fundamentally, however, the Article wages a sustained critique of the system of firearms carceralism that fronts aggressive law enforcement and draconian terms of incarceration. It describes the unjustifiable breadth and depth of these practices and the harmful, racialized, and exclusionary values they simultaneously draw from and reinscribe. Finally, the Article argues in favor of three alternative paths to equitable peace and safety. First, it outlines private sector steps to, for example, dampen illicit firearms supply. Second, it highlights civil legal interventions like red flag laws and tort lawsuits against irresponsible gun sellers. Third, and most prominently, it underscores the promise of community violence intervention and restorative justice programs to bring meaningful safety apart from the carceral tools of coercive control.

MINNESOTA LAW REVIEW [108:2811), 2024.

By Noémie Bouhana | Caitlin Clemmow | With contributions from Philip Doherty

Post 9/11, research on radicalisation and involvement in terrorism and violent extremism (henceforth, ITVE) has focussed on the role of individual-level attributes, such as the psychological characteristics, socio-economic background, demographic features, experiences, beliefs, past behaviours and criminality, and the social embeddedness of radicalised individuals and people involved in acts of terrorism (Borum, 2011; Stern, 2016; McCauley & Moskalenko, 2017; Sageman, 2008; Wiktorowicz, 2005). Likewise, existing processes, methods and tools to identify and evaluate the risk of ITVE operate largely at the individual level. The Vulnerability Assessment Framework (VAF) used in the context of Channel is the best example of this. Comparatively less attention has been devoted to identifying and evaluating the characteristics of the socio-physical contexts which may contribute to the emergence of the risk of ITVE, or, conversely, to its suppression. Yet research on crime, arguably a closely related problem space, makes a strong case that many of the causes and enabling conditions of criminal development (of which ITVE is an instantiation) are found in the environment: crime and criminals concentrate in space and time. Modifying the environment in which crime occurs and the specific settings in which criminals develop and act has been shown at length to be an effective approach to crime prevention and disruption (Weisburd et al., 2012). In crime prevention, as in other areas of behavioural change, one size does not fit all: to design effective programs, the ability to tailor interventions to the socio-physical context is paramount, which means that the effect of key contextual features on the outcome of interest must be understood (Sampson et al., 2013); notably, the effect of exposing (susceptible) individuals with particular kinds of characteristics to (criminogenic) places with particular kinds of features. Situational Action Theory [SAT] is a theory of crime causation, which, as its name suggests, puts context at the centre of the explanation of crime (P.- O. H. Wikström et al., 2009). In 2010, ahead of the revision of the Prevent Strategy, the UK Home Office commissioned a Rapid Evidence Assessment of the cause of al-Qaeda-influenced radicalisation seen through the lens of SAT (Bouhana & Wikström, 2011), which identified the key levels of analysis in a causal model of radicalisation as relating to individual vulnerability to radicalising influence, exposure to radicalising settings, and the mechanisms of emergence of said settings. In the decade since, this theoretical model has been refined and now underpins a research programme concerned chiefly with going beyond "who" and "why" to the "where" of terrorism involvement. It has inspired, notably, the EU FP7-funded international PRIME project on lone actor terrorism, which, among other findings, has shown that individual-level risk indicators are multifinal (i.e., their meaning determined by the context in which they arise), and has provided support for a formulation of individual vulnerability which encompasses susceptibility to exposure to radicalising settings, as well as cognitive susceptibility to moral change with significant implications for prevention efforts (Corner et al., 2018). It has also produced evidence for distinct configurations of individual/ context interaction patterns leading to the emergence of lone actor risk, with further implications for risk assessment (Clemmow et al., 2019). To better support policy strategy and counter-terrorism practice, the theoretical SAT model of radicalisation was reformulated and expanded into a risk analysis framework for lone actor terrorism [PRIME RAF] (Bouhana et al., 2016, 2018) and a systemic inference framework to inform counter-extremism strategies [S5], commissioned by the UK Counter-Extremism Commission (Bouhana, 2019). Both of these integrate SAT with the broader behavioural and socio-cognitive knowledge-base to refine our understanding of personenvironment interaction. While the RAF is concerned specifically with the effect of situational interaction on the motivation and capability of lone actors to act (behaviour), S5 is more broadly focused on explaining the acquisition of extremist propensities (beliefs). Both frameworks are analytically related and can be logically integrated. However, these remain general frameworks. Inherent in their interactionist logic is the fact that, while environmental processes of risk can be set out in generic terms, specific risk (or protective) factors and – crucially – their observable indicators must be elicited with regards to a particular context. This is because indicators are subject to change over space and time (P. O. H. Wikström & Bouhana, 2017) and because risk assessment is most effective when calibrated to context (Hamilton et al., 2021). A recently completed, Home Office-funded project guided by S5 (State of the Union [SOTU]; Bouhana and Schumann, 2021), which aimed to assess the observability of key analytical concepts of mainstream models of terrorism involvement, demonstrated the difficulty, yet also the necessity of translating said concepts into observable indicators, inasmuch as any model is intended to guide risk assessment or intervention design and evaluation. It also suggested that environmental indicators may be more reliably observed than susceptibility-related indicators using commonly available sources of information, and it tentatively provided further support for the notion that susceptibility and exposure interact in specific ways, leading to the emergence of risk. This project investigated the feasibility of developing a framework to assess the risk of involvement in terrorism and violent extremism at the level of place, with a view towards – further down the line – designing an assessment tool along the lines of the Vulnerability Assessment Framework, intended to assess environments instead of individuals. As a first step towards establishing this feasibility, this project investigated whether the mechanisms articulated in the S5 framework could be operationalised; in other words, to what extent they could be associated with a set of observable indicators relevant to the UK ITVE context. Given the relative scarcity of empirical research into the characteristics of extremist social ecologies and settings in the UK (and largely elsewhere) – which would be prerequisite to the conduct of a systematic review – the researchers elected to carry out an e-Delphi exercise with U.K. Prevent practitioners, the results of which are presented at length in this report.

London: CREST - Centre for Research and Evidence in Security Threats (CREST), 2025. 50p.

By Paul M. Reeping, Hannah S. Laqueur & Rose M. C. Kagawa

To date, there have been no peer-reviewed studies in the United States estimating the impact of gun-free zone policies in alcohol-serving establishments on rates of firearm violence in and around such establishments. In this study, we utilized a cross-sectional design to estimate the impact of Texas’s 51% alcohol law, which prohibits the carrying of firearms in establishments that generate over half of their revenue from alcohol sales. The analysis focused on the difference in shooting incidents in and around establishments with and without firearm carrying prohibitions in 2021 and 2022. After adjusting for establishment type (bar/restaurant), alcohol sales volume, census tract level demographic factors, and the number of nearby restaurants and bars, results indicated that gun-prohibiting bars experienced significantly fewer shootings compared to those that allowed guns. Specifically, establishments that were gun-prohibited had 37% fewer shootings within 50 m than those that were gun-allowing, with a 95% confidence interval ranging from 60% fewer to 0.2% fewer. This association was more prominent in bars than in restaurants. The protective association with gun-prohibited status diminished with increased distance from the establishments; results were not significant at 100 m. Our study findings align with research suggesting that gun-free zones can reduce firearm violence. However, future studies using quasi-experimental designs that can better support causal inference are needed to support such a conclusion, as are studies exploring the efficacy of such policies in various settings and over longer periods.

Texas. J Urban Health, 2024, 9p.

By Dru Stevenson

Firearm policy in the United States is subject to longstanding political gridlock. Up to now, most of the legal academic literature has focused on the constitutionality of various—or any—regulations regarding firearm possession, sales, or usage. This article inverts the problem and proposes a system for voluntary registration and certification of nonowners, those who want to waive or renounce their Second Amendment rights as a matter of personal conviction. The proposed system is analogous to both the registration of conscientious objectors during wartime conscriptions, and the newer suicide prevention laws whereby individuals can add their names to a do-not-sell list for firearm dealers—though the proposal made here is broader and more permanent. Voluntary registration, with official certification, would serve three important purposes. First, this would help create social identification markers for the gunless-by-choice movement, something that historically has been missing; formal signals and labels of identification with a movement are necessary for a movement’s success, especially with prohibition or abstinence movements. Second, registration and certification as gunless would be a personal moral commitment marker; all societies provide ways for solemnizing one’s vows and solidifying one’s resolve on serious, lifelong moral decisions. Third, certification allows for a market signaling effect, providing useful information that can trigger a beneficial response from the private sector; market responses, in turn, provide useful information about otherwise hotly-debated beliefs, such as whether guns in fact enhance or reduce safety for individuals and public places. This article develops each of these points and offers a unique and simple regulatory and statutory alternative for a new system of registration and certification.

86 Brook. L. Rev. (2021).

By C4ADS

Executive Summary

Gun violence in Guatemala is fueled by the licit import of handguns. Once weapons have entered Guatemala, illicit actors have greater opportunity to divert these firearms from their intended use and users, instead wielding them to pursue crime and perpetrate violence.

This report uses seizure data and supply chain analysis to assess how the international flow of weapons into Guatemala is vulnerable to diversion, or the rerouting of licitly transferred conventional arms from their intended recipient or use.

This analysis reveals:

Handguns are the predominant weapon type used in violent crime in Guatemala. Many of the seized handguns are produced by major international weapons manufacturers such as Glock, Israeli Weapons Industries (IWI), Taurus, and Beretta.

Diversion pathways in-country appear among private citizens, commercial, andgovernment actors, presenting opportunities for illicit actors to acquire licit firearms.

Handguns, predominantly those made by top manufacturers, continue to flow into Guatemala.

These weapons are most often manufactured in the U.S., Brazil, and Turkey.

Manufacturers or entities within the manufacturer’s corporate network account for most handgun exports to Guatemala.

Handguns entering Guatemala primarily do so via air. They often transit through third countries and/or third parties, complicating due diligence and creating greater opportunity for diversion.

The U.S., Canada, and Germany are the most common transit countries for Guatemalan handgun imports.

U.S. gun stores are the most common non-manufacturer exporters of handguns to Guatemala.

The majority of Guatemalan importers are not end-users, but retailers that sell to both government and civilian consumers.

This report uses cases of weapons seizure and diversion to explore each of these findings. Using new data, we re-examine a case of Israeli arms that were sold in Guatemala in exchange for weapons later diverted to paramilitary forces in Colombia.

These findings illuminate areas where Guatemalan and international stakeholders can do more to counter the diversion of firearms in Guatemala. To this end, the report makes targeted recommendations for closing gaps in current legislation and enforcement.

Washington, DC: C4ADS2025. 24p.

By Richard Stansfield, Daniel Semenza, Jie Xu, Elizabeth Griffiths

This study uses a combination of tract-level and street network-level analyses to exam-ine: (1) the overall association between federally licensed firearm dealers (FFLs) and homicides, (2) the relation-ship between dealers with serious violations (such as selling to prohibited buyers or failing to record sales)and homicide, and (3) whether the dealer–homicideassociation is moderated by community disadvantage.Results replicate and confirm a relationship between dealers and homicides in disadvantaged neighborhoods.Importantly, however, we also find that proximity to non compliant dealers specifically elevates the risk of lethal violence.Policy implications: We detail how a coordinated effort between federal, state, and local agencies to reg-ulate firearm dealers and ensure that legal compliance can be instrumental in reducing gun violence. There Is a clear need for increased oversight of gun dealers and more robust policies that hold negligent dealers accountable, including the necessary funding and regu-latory manpower to enable regular auditing and support consistent follow-up for noncompliant dealers. A com-prehensive policy framework that supports supply-side gun violence reduction should include additions to state-level laws that require record keeping, videotap-ing and store security, and regular inspection for firearm dealers.

Criminology & Public Policy, 22, 323–345.

By Rocco Pallin, Amanda J. Aubel, Christopher E. Knoepke, Veronica A. Pear, Garen J. Wintemute & Nicole Kravitz-Wirtz

Background

Following the 2018 mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, there was a dramatic increase in media coverage of extreme risk protection orders (ERPOs) and in state policy proposals for ERPO laws. This study documents the frequency of news coverage of ERPOs throughout 2018 and examines the narratives used by media outlets to describe this risk-based firearm policy.

Methods

Using a mixed-method descriptive design, we examine the frequency of national news media coverage of ERPO legislation in 2018, before and after the Parkland shooting, and analyze the content of news articles related to a sample of states that considered ERPO legislation after the shooting.

Results

We find a sharp increase in the frequency of articles related to ERPOs following the Parkland shooting and smaller increases in coverage surrounding ERPO policy proposals and other public mass shootings that year. Nearly three-quarters of articles in our content analysis mentioned the Parkland shooting. The news media often mentioned or quoted politicians compared to other stakeholders, infrequently specified uses for ERPOs (e.g., prevention of mass violence, suicide, or other violence), and rarely included evidence on effectiveness of such policies. More than one-quarter of articles mentioned a mass shooting perpetrator by name, and one-third of articles used the term “gun control.”

Conclusions

This study describes the emerging public discourse, as informed by media messaging and framing, on ERPOs as states continue to debate and implement these risk-based firearm violence prevention policies.

BMC Public Health 21, 1986 (2021), 13p.

By Elizabeth B. Klerman, Mahmoud Affouf, Rebecca Robbins, Jay M. Iyer|| , Cornelia Griggs, Peter T. Masiakos, Chana A. Sacks

Developing interventions to prevent firearm-related violence and to address its consequences requires an improved understanding of when these violent events are most likely to occur. We explored gunshot events in 6 of the most populated cities in the United States by time of day, day of week, holiday/ non-holiday, and month using publicly available datasets. In some of these cities, gunshot events occurred most often at nighttime, on holidays and weekends, and during summer months, with significant interaction effects. There were also time-related changes in characteristics of the victims. Primary prevention efforts aimed at curbing firearm-related violence should consider these differential risks.

J Biol Rhythms. 2024 February ; 39(1): 100–108.

By Center for Neighborhood Engaged Research & Science (Corners)

Gun violence is an urgent, but often overlooked, issue in Latino1 communities. With hundreds of Latinos shot and killed every year2, it is important to understand the unique forces that drive violence in Latino communities. This brief provides a descriptive overview of Latino gun violence victimization in Chicago. While most analysis in this brief is done at the city scale, we acknowledge that Latino communities in Chicago are diverse and that community violence intervention organizations who work in these communities employ different approaches that are responsive to their hyper-local context. We examine definitions, demographics, and gun violence networks before concluding with a summary of a convening of practitioners, leaders, and researchers in December 2022.

Chicago: CORNERS, 2022. 9p.'

By Amnesty International

A wide variety of electric shock devices are specifically designed for and marketed to law enforcement. These range from electric shock stun guns, batons and shields, and body-worn electric shock devices which deliver electric shocks through direct contact with the body; to projectile electric shock weapons (PESWs) which can be fired from a distance. Despite the clear human rights risks associated with this equipment, there are no global regulations controlling what type of electric shock law enforcement equipment is permitted to be manufactured and used, or where equipment which can have a legitimate role in law enforcement can be traded. There is an urgent need for legally-binding, global regulations – a Torture-Free Trade Treaty - which prohibits the production of and trade in inherently cruel, inhuman and degrading devices, such as direct contact electric shock equipment, and strictly controls the trade in PESWs to law enforcement agencies to ensure

London: Amnesty International, 2025. 72p..  

By Remadji Hoinathy, Malik Samuel and Akinola Olojo

  Some Lake Chad Basin countries (Cameroon, Chad, Niger and Nigeria) have been dealing with violent extremism for over a decade. Disarmament, demobilisation, repatriation, reintegration and resettlement processes in these countries may offer useful lessons for other West African contexts, including Mali and Burkina Faso, or more recently affected countries such as Benin, Côte d’Ivoire and Togo. Such lessons include incentivising defections, coordinating at national and regional levels, gender sensitivity, appropriate legal frameworks and community engagement.

Key findings Understanding the circumstances that lead people to join and leave violent extremist groups, and their experiences in those groups, is key to crafting incentives for disengagement. The willingness to leave violent extremist groups is often clouded by uncertainty, as well as long waiting periods between disengagement and enrolment in programmes for disarmament, demobilisation, repatriation, reintegration and resettlement (DDRRR). Waves of defection from Boko Haram caught Lake Chad Basin (LCB) states unprepared. DDRRR processes were thus implemented under pressure, hindering early coordination at a regional level. Women are treated mainly as victims, despite some voluntarily joining and playing active roles in Boko Haram, including volunteering as suicide bombers. DDRRR implementation in the LCB has revealed gaps in legal frameworks that require revisions. DDRRR lacks public support in some LCB countries, as many people view it as blanket amnesty for Boko Haram members. 

Recommendations Non-military means of countering violent extremism should incorporate incentives and opportunities for associates to leave these armed groups. By depleting these groups’ human resources, their fighting capacity is reduced. To encourage defection, clear processes for screening, prosecution and integration are needed. National ownership of these processes, inclusivity, adaptation to local context and adequate resourcing are key, from inception to implementation. National ownership should not lead to isolated approaches, but rather create bridges between countries to enable a cohesive regional approach. Organisations such as the Economic Community of West African States, the Liptako-Gourma States Integrated Development Authority, the G5 Sahel and the Accra Initiative could offer relevant regional frameworks for this. Authorities in charge of DDRRR programmes should consider the diverse needs and backgrounds of ex-associates. Distinguishing individuals according to why they joined and their roles within the groups is important for providing appropriate treatment. The specific needs of women and children should be taken into account. Affected West African countries should proactively formulate relevant legal and institutional frameworks. International and regional provisions and standards should be taken into account, including the need for transparent and predictable screening, prosecution and rehabilitation processes. Due to their position connecting the LCB and West Africa, Niger and Nigeria could play a key role in sharing lessons learned from DDRRR implementation. Community organisations, platforms, and media should be used by the DDRRR authorities to raise public awareness of the reintegration process. This would help prevent perceptions of general amnesty for Boko Haram members and preconceived ideas about the disengaged from undermining the process. 

Pretoria: Institute for Security Studies, 2023. 12p.

By ENACT Africa

  Summary Armed groups’ involvement in illegal mining in Nigeria has exacerbated arms smuggling, consequently increasing insecurity and violent conflict in the country and across the Sahel. It’s also seen a rise in the kidnapping of women and girls for forced labour in the mines. Governments must deal with the socio-economic and political factors that sustain banditry in Nigeria’s North West Region, the involvement of armed groups in illegal mining and the transnational dimensions of the crime. Key points • Armed groups engage in illegal mining due to corruption by state actors and community members, as well as poverty and a lack of opportunities. • Inconsistencies in Nigeria’s mining sector regulations, specifically between the Nigerian Minerals and Mining Act, 2007, and the Land Use Act, 2004, exacerbate the problem. • Armed groups’ control of mining areas undermines government legitimacy and stability. • Militarisation has been unproductive and security forces are compromised by corruption. • Illegal mining fuels security problems and the proliferation of small arms and light weapons. • The transnational criminal market for illegally mined gold extends to Chad, India, Lebanon, Niger and the United Arab Emirates. • The use of girls in mining violates international labour laws.

ENACT Africa, 2024. 24p.

By Jillian Peterson; Gina Erickson; Kyle Knapp; and James Densley

Understanding the motivation of a mass shooter’s intent to do harm can help practitioners and policy makers develop more effective intervention strategies. OBJECTIVE To examine the prevalence of communication of intent to do harm, known as leakage, in a sample of 170 mass public shooters from 1966 to 2019; the characteristics of perpetrators who do and do not leak their plans; and whether leakage is a form of fame-seeking behavior or a cry for help among individuals who are in crisis or suicidal. DESIGN, SETTING, AND PARTICIPANTS This cross-sectional study included perpetrators who killed 4 or more people in a public space from 1996 to 2019 and were included in a comprehensive database of US mass shootings. That database was built from August 2017 to December 2019, and analysis took place from January to May 2021. MAIN OUTCOMES AND MEASURES Leakage was identified and coded using publicly available records. Any communication to a third party of an intent to do harm prior to the shooting was coded as leakage. Logistic regression models were used to examine the risk factors associated with leakage. Models estimating leakage were examined to assess the 2 hypothesized pathways to leakage (the cry-for-help model and the fame-seeking model). RESULTS The 170 participants in this sample included 166 (97.7%) male perpetrators and 3 (2.3%) female perpetrators, with a mean (SD) age of 34 (12) years. Overall, 161 participants had known race and ethnicity: 11 (6.8%) Asian individuals, 35 (21.7%) Black individuals, 14 (8.7%) Latinx individuals, 7 (4.4%) Middle Eastern individuals, 3 (1.9%) Native American individuals, 89 (55.3%) White individuals, and 2 (1.2%) individuals with other race and ethnicity. Overall, 79 mass shooters (46.5%) leaked their plans. Of perpetrators who leaked their plans, 35 (44.3%) leaked specific plans about a mass shooting, and 44 (55.1%) leaked nonspecific plans about generalized violence. The study findings indicate that leakage was associated with receiving counseling (odds ratio, 7.0; 95% CI, 2.0-24.8) and suicidality (odds ratio, 3.7; 95% CI, 1.0-13.6), suggesting that leakage may best be characterized as a cry for help from perpetrators prior to their act.  

JAMA Netw Open. 2021;4(11):e2133073. doi:10.1001/jamanetworkopen.2021.33073

By Leslie M. Barnard; Erin Wright-Kelly; Ashley Brooks-Russell; et al

  Mass shootings (MS) account for less than 1% of firearm deaths in the US, but the frequency has increased.1 Risk factors for MS perpetration include societal discrimination, contagion effects, firearm access, mental illness, and substance abuse.2 Previous geographically and analytically limited studies found MS with handguns had higher fatality rates than those with rifles,3 and following an age-based assault weapons (AWs) restriction there was a reduction in firearm violence from AWs.4 Another study found that the 1994 federal AWs ban was associated with fewer MS.5 To further investigate the association between type of firearm and lethality of MS, this study examined what firearms were present at publicly targeted fatal MS and determined if AWs were associated with a higher number of injuries or deaths.

JAMA Netw Open. 2025;8(2):e2458085. doi:10.1001/jamanetworkopen.2024.58085 4p.

By Zachary Porreca

I demonstrate the linkage between gentrification and gun violence. As the underlying mechanism, I focus on gentrification's displacement effect on local drug markets. Using two-way fixed effects differences-in-differences estimators, I show the gentrification of one block increases violence across the surrounding neighborhood. I find that some 2,400 (8%) of Philadelphia's shootings between the years 2011 and 2020 can be attributed to spillover effects from the gentrification of drug blocks. This effect is nearly ten times stronger than that observed on blocks without high levels of drug crime. This study also contributes a new empirical measurement of gentrification drawn primarily from property sales, along with building, zoning, and alteration permit issuance and utilizes a novel nearest-neighbor network approach to identify spatial spillover effects.

Unpublished Paper, 2021, 53p.

By Irfan Idris and Kusumasari Ayuningtyas

The ideological influence of Jemaah Islamiyah continues to be a threat to security even after its disbandment in June 2024. Some of its former members may align with other extremist groups, while others may seek to operate as lone-wolf terrorists. The possibility of JI’s former members transitioning into lone wolf actors stems from the enduring power of its ideology and indoctrination process.

S. Rajaratnam School of International Studies, NTU Singapore, 2025, 3p.