Edited by Morten Bøås, Gilad Ben-Nun, Ulf Engel, and Kari Osland

Precarious living conditions across the Balkans, the Middle East, and North Africa create fertile ground for radical ideas. Yet, despite genuine grievances and legitimate grounds for anger, most people living in these regions are not radicalized and do not embrace ideas that lead to acts of violent extremism. Which raises the question ... why?

To answer this question, the authors of Resisting Radicalization investigate the nonoccurrence of violent extremism in what they term enabling environments. Their work, the result of a multiyear international project, has critical implications for the future of P/CVE (Preventing and Countering Violent Extremism) programs.

Boulder, CO: Lynne Rienner Publishers, Inc., 2025, 293p.

Metropolitan Police Department, Washington D.C.

On the morning of Monday, September 16, 2013, Aaron Alexis entered Building 197 at the Washington Navy Yard, where he served as an independent contractor, and carried out the most deadly workplace mass shooting in the Nation’s Capital in recent memory.

Over the course of 69 minutes, Alexis terrorized thousands of employees of Naval Sea Systems Command, firing indiscriminately from a shotgun he had legally purchased two days earlier and a handgun he had taken from a security guard after mortally wounding the guard. He would also get into multiple shooting engagements with responding law enforcement officers, seriously injuring a Metropolitan Police Department (MPD) officer. In his final confrontation with police, Alexis ambushed and fired upon another MPD officer. Fortunately, the officer was saved by his protective vest and was able to return fire, killing Alexis and ending his rampage. When it was over, Alexis had shot and killed twelve people and injured several others.

*****

In the aftermath of the incident, the members of MPD first and foremost want to remember and honor the twelve people who lost their lives. Twelve people went to work that Monday, but did not return home to their loved ones. It is truly a senseless tragedy beyond comprehension, and there are no words adequate enough to express our condolences. Our thoughts remain with the victims’ families and friends.

Metropolitan Police Department, Washington D.C. 2014.. 84p.

Corrigan, Jack; Flagg, Melissa; Murdick, Dewey

From the document: "This brief aims to provide a framework for a more systems-oriented technology and national security strategy. We begin by identifying and discussing the tensions between three strategic technology and national security goals: '1. Driving technological innovation. 2. Impeding adversaries' progress. 3. Promoting safe, values-driven deployment.' We go on to provide a brief overview of 15 levers of power through which policymakers can pursue these goals. These proposed levers fall into two categories: 'direct levers of power' (there are nine), which are focused on discrete functions and issue sets; and 'enabling levers of power' (there are six), which are more general-purpose and can be used to enhance the effect of the direct levers. These proposed categories are based on our own analysis, and while the list is non-exhaustive, it provides a useful framework for characterizing government actions and aligning them to particular goals of technology policy. [...] This adaptable framework, suitable for any country or international body, emphasizes the importance of creative problem-solving and having a comprehensive understanding of the policy landscape to achieve strategic goals. This framework is intended for decision-makers and stakeholders in the realms of technology, national security, and economic policy."

Georgetown University. Walsh School of Foreign Service. Center for Security and Emerging Technology. 2023. 33p.

By Everytown for Gun Safety and Johns Hopkins Center for Gun Violence Solutions. ( 

Extreme Risk Protection Order (ERPO) laws create an opportunity to intervene and prevent firearm violence when there are warning signs that an individual poses a risk of harm to self or others. While ERPO laws are relatively new, a growing body of research demonstrates the potential for these laws to prevent firearm violence, particularly firearm suicide, and multiple victim/mass shootings. Interest in ERPO laws has increased in recent years, with 16 states having enacted these laws between 2018 and 2023. Implementation varies widely across and within states. As a result of strong ERPO implementation efforts in some jurisdictions, more information is now available for state and local leaders about how to implement and adapt ERPO laws for their own communities. In addition, the Bipartisan Safer Communities Act of 2022 included $750 million in new federal grant funding for states, some of which is designated to support ERPO implementation. To meet this moment, the Everytown for Gun Safety Support Fund and the Johns Hopkins Center for Gun Violence Solutions have partnered to compile this guide of the best available practices and promising approaches to effective implementation of extreme risk laws. These recommendations are informed by conversations with individuals who are pioneering ERPO implementation, in addition to the best practices shared at a December 2022 convening of ERPO leaders from around the country.   

New York; Baltimore: The Authors: 2023. 52p.  

By  Grahame Allen, Matthew Burton and Alison Pratt

The beginning of the millennium saw an increased political focus on the threat from international terrorism, heightened by the attack on the Twin Towers on 11 September 2001. Only one year before 9/11, new counter-terrorism legislation had been passed in the UK. Designed to reform and extend state powers found in previous counter-terrorism legislation, the Terrorism Act 2000 gave increased powers to the Home Secretary and the police. It moved the focus of counter-terrorism to all forms of domestic and international terrorism, rather than just Northern Ireland-related terrorism. In 2003, the Government introduced its counter-terrorism strategy, CONTEST. Now in its fourth iteration, CONTEST aims to reduce the risk to the UK from terrorism with four objectives:

• Pursue: to stop terrorist attacks

• Prevent: to stop people becoming terrorists or supporting terrorism

• Protect: to strengthen protection against a terrorist attack

• Prepare: to mitigate the impact of a terrorist attack

Although statistics relating to terrorism and the use of counter-terrorism legislation have been collected by the Home Office since the 1970s, the publication (and consistent collection) of data was halted in 2001. This briefing examines the available statistics on terrorism in Great Britain including:

• Deaths due to terrorism

• The use of stop and search legislation

• Terrorism arrests

• Pre-charge detention periods

• Prosecutions and convictions for terrorism

• Terrorist prisoners

• The use of TPIMS

• The number of foreign fighters fighting in Syria

London: Home Office Library, 2022. 37p.

By The Philadelphia Interagency Research and Public Safety Collaborative (PIRPSC)

Firearm violence in Philadelphia is a public health crisis. In 2021, Philadelphia suffered a record number of fatal criminal shooting victims (501) and non-fatal criminal shooting victims (1,850). Philadelphia has also experienced extraordinary recent increases in arrests for illegal firearm possession and crime guns recovered, while the Commonwealth has recorded record gun sales in 2020. Despite this crisis in gun violence, shooting arrest rates remain low, conviction rates in illegal gun possession cases have been declining since 2015, and conviction rates in shooting cases declined between 2015 and 2019 and increased modestly in 2020 and 2021.

Firearm violence in Philadelphia is a racial justice crisis. Shootings disproportionately impact Black communities: in Philadelphia over 80% of shooting victims and 79% of arrestees have been Black since 2015. Both victims and arrestees overwhelmingly come from disadvantaged neighborhoods that are majority non-white, have high rates of poverty and unemployment, and less likely to have a high school degree or diploma. Endemic violence in these communities means that the vast majority of those arrested for gun violence have themselves been previously traumatized, often as a witness to previous violent acts; over 80% have previously accessed or been screened for behavioral health services through the City. Because the causes of gun violence are complex and varied, so are the solutions. Addressing the gun violence crisis requires a comprehensive strategy with elements of enforcement, intervention, and prevention to achieve both short-term and long-term reductions in gun crimes. Collaboration among city agencies, including law enforcement and non-law enforcement agencies is critical to successfully implement such a comprehensive strategy. Reviews of evidence-based practices, along with data analysis of local data, have helped us to come to key findings related to gun violence in Philadelphia and have informed recommendations to stem that violence. Readers are encouraged to read both the summary, below, as well as the report in its entirety to understand the context of our recommendations as well as the limitations in both our data and data analyses. 

Philadelphia: Philadelphia Interagency Research and Public Safety Collaborative (PIRPSC)    2022. 196p.  

By Ramon Spaaij

What drives the lone wolf terrorist to commit mass violence? What are their ideologies and motivations? How do they plan and carry out their attacks, and who do they target? How can lone wolf terrorism be effectively countered? One of the first in-depth analyses of lone wolf terrorism, this publication sets out to answer these questions. Drawing on extensive international data and qualitative case studies, it examines the global patterns in and key features of lone wolf terrorism over the past four decades. This engaging text will be essential reading for students and researchers on terrorism and violent conflict and offers unique and invaluable insights to those working to prevent or minimize the effects of terrorism and political violence.

Cham: Springer, 2012. 124p.

By Jillian Carr

Gunshot detection systems are used by policing agencies across the U.S. to detect incidents of firearms discharge. The most commonly used gunshot detection system is ShotSpotter, currently deployed in more than 100 cities across the U.S.1 Such systems typically use sensors, placed strategically throughout a particular area, to pinpoint the location of gunfire. Agencies that adopt the technology hope that it can help them reduce gun violence and make communities safer. They report that the technology can alert officers to gunshots that otherwise would not be reported, and that it can reduce officer response times by directing them to a more precise location. But the technology can be quite expensive—costing several hundred thousand dollars or more per year to maintain.

We found that in areas of St. Louis County that used ShotSpotter technology, police were alerted to four times as many gunshot incidents during the study period than in comparable areas without the technology. Despite responding to more calls related to gunfire, we found that reported assaults, which include gun-related assaults, fell by roughly 30 percent in areas with ShotSpotter. Moreover, the technology did not produce changes in the number or pattern of arrests. Because we did not find racially disparate effects on the prevalence of crime reporting or arrests from the adoption of the technology, ShotSpotter’s social costs appear minimal.

New York: Policing Project at New York University School of Law, 2021. 18p.

By Charles M. Katz, Michaela Flippin, Jessica Huff and William King

In 2017, the Phoenix (AZ) Police Department was awarded BJA funding for establishing the Phoenix Crime Gun Intelligence Center (CGIC). The CGIC was a collaborative partnership of law enforcement agencies and experts including the Department's Crime Gun Intelligence Unit (CGIU), the Police Crime Laboratory, the Maricopa County Attorney's Office, the ATF's Phoenix Field Division, and Arizona State University’s Center for Violence Prevention and Community Safety. .. Overall, we found the CGIC's processes, as determined by its written policies and procedures, to have been consistently carried out as planned, and their impacts for the most part to be as expected or trending in a positive direction.

Phoenix, AZ: Center for Violence Prevention & Community Safety, Arizona State University. 2021. 68p.

By Jaclyn Schildkraut

The May 24, 2022, mass shooting at Robb Elementary School in Uvalde, TX, where 19 fourth grade students and two of their teachers were killed and 17 others were injured, reignited a national discourse about preparing school communities for similar tragedies. Proposals ranging from armed teachers to clear backpacks were circulated, despite the lack of empirical evidence to support their efficacy in situations like Uvalde. This leaves an important question for stakeholders charged with keeping school communities safe: what is the best way to reduce the harm caused by these events that is evidence-based?.

Despite the widespread use of lockdown drills in US schools, the conversation about their efficacy remains contentious and often is not guided by empirical evidence. This brief provides an overview of the scholarly evidence surrounding lockdown drills, as well as considerations of best practices, an important foundation for policymakers tasked with keeping students and staff safe and for the public to better understand their utility in schools.

Albany, NY: Rockefeller Institute of Government, 2022. 20p.

By Chris Eades, Roger Grimshaw, Arianna Silvestri. and Enver Solomon

The Centre for Crime and Justice Studies (CCJS) first published this briefing paper in August 2006. It received widespread media coverage and a great deal of interest from the police, voluntary sector organisations and members of the public. This review aims to draw together some of the existing information and research on these issues and makes tentative assessments of the programmes in place to combat knife usage. The paper begins by providing information from the available sources on the extent of the problem as it pertains to different levels of seriousness: the carrying of knives; the use of knives in crime; and the use of knives in homicides. It then investigates possible reasons for knife carrying before establishing which sections of the population are most likely to suffer knife-related offences. Next, assessments are made of the current strategies being considered or used to reduce levels of knife carrying and knife use. These include the national knife amnesty, police stop and search, increased prison sentences, education and awareness-raising, and prevention strategies.

London: Centre for Crime and Justice Studies, King’s College London, 2007. 36p.

By William Godnick

This monograph is a modified version of a background paper prepared for a conference that took place in Ottawa, Canada in May 2001, bringing together representatives of the Member States of the Organization of American States (OAS), non-governmental organizations (NGOs) and civil society to discuss issues related to the July 2001 United Nations (UN) Conference on the Illicit Trade in Small Arms and Light Weapons in All Its Aspects (hereafter referred to as the UN Conference). This version takes into account the Programme of Action (PoA) adopted by the UN Member States as well as other emerging or consolidated initiatives in the western hemisphere.

British American Security Information Council, International Alert and Saferworld, 2002. 26p.

By U.S. Bureau of Justice Assistance

Throughout the United States, violence involving firearms remains at an alarmingly high rate. The Federal Bureau of Investigation’s 1996 Uniform Crime Reports indicates that firearms were used in 29 percent of all murders, robberies, and aggravated assaults in the United States in that year. According to the Centers for Disease Control and Prevention, firearms-related violence is a leading cause of injury-related death, second only to automobile-related fatalities. To stop the illegal flow of firearms to persons with criminal intent, law enforcement must develop strategies to address problems with gun dealers, stolen weapons, and illegal purchasers and suppliers. Furthermore, law enforcement cannot ignore the role that both nonlicensed and dishonest licensed firearms dealers play in the illegal movement of weapons. To address the illegal firearms trafficking issue, the Bureau of Justice Assistance created the Firearms Trafficking Program in fiscal year 1993. Three different initiatives were funded under this program: the Firearms Licensee Compliance Program, the Firearms Investigative Task Force Program, and the Innovative Firearms Program. Demonstration sites under each of these three initiatives were visited to identify goals, lessons learned, and promising practices and approaches of each project.

Washington, DC: U.S. Bureau of Justice Assistance, 2000. 96p.

By Philip Alpers and Amélie Rossetti

Four consecutive formal reports have now found that no Australian State or Territory has at any stage fully complied with the 1996 or 2002 firearm resolutions which collectively formed the National Firearms Agreement. In important areas, State and Territory legislation has been blocked or revised to dilute the effect of the NFA. This report, commissioned and funded by Gun Control Australia, finds that on balance, both non-compliance from day one and two decades of political pressure have steadily reduced restrictions and undermined the NFA’s original intent.

Sydney: Gun Control Australia, 1997. 102p.

By Michael Rocque, Grant Duwe, Michael Siegel, James Alan Fox, Max Goder-Reiser, and Emma E. Fridel

In the past decade, mass shootings, particularly those that take place in public areas, have increasingly become part of the national conversation in the United States. Mass public shootings instill widespread fear, in part because of their seeming randomness and unpredictability. Yet when these incidents occur, which has been with somewhat greater frequency and lethality as of late, public calls for policy responses are immediate. In this policy brief, we review efforts to evaluate the effect of gun control measures on mass public shootings, including a discussion of our recently published study on the relationship between state gun laws and the incidence and severity of these shootings. The findings of this work point to gun permits and bans on large capacity magazines as having promise in reducing (a) mass public shooting rates and (b) mass public shooting victimization, respectively. Interestingly, however, most gun laws that we examined, including assault weapon bans, do not appear to be causally related to the rate of mass public shootings.

Albany, NY: Rockefeller Institute of Government, 2021. 20p.