By Mark Hamm and Ramon Spaaj

This research offers the largest and most comprehensive database ever created on lone wolf terrorism, along with a theory-informed case study component based on direct contact with imprisoned lone wolf terrorists, and a comparative analysis distinguishing lone wolves from those who undergo radicalization in a group setting. Strictly in terms of lethality, the data indicate that lone wolf terrorism in America is not on the rise. Although lone wolf terrorism may not be increasing, it is undergoing two important changes in modus operandi. First, uniformed police and military personnel have become the primary target of lone wolf terrorists. Second, consistent with the relaxation of U.S. gun laws since the 1990s and the recent trend in mass shootings, the lone wolf’s preferred weaponry is now a staggering range of high-velocity firearms. While there is no standard profile of the lone wolf terrorist, most of them are unemployed, single white males with a criminal record. Compared to members of terrorist groups, lone wolves are older, less educated and more prone to mental illness. The study validates a series of commonalities associated with pathways to radicalization for lone wolf terrorists. The radicalization model indicates that lone wolf terrorism begins with a combination of personal and political grievances which form the basis for an affinity with online sympathizers. This is followed by the identification of an enabler, followed by the broadcasting of terrorist intent. The final commonality is a triggering event, or the catalyst for terrorism. The ability of law enforcement and intelligence communities to detect and prevent lone wolf terrorism demands a clear understanding of these radicalization processes. Such insight may provide investigators with a sort of detection system, or “signatures”—as minimal as they may appear—that an individual with a terrorist intent will demonstrate in preparing for an attack. Crucial to this understanding is the broadcasting of intent. While lone wolves physically isolate from society, at the same time they seek recognition for their causes through spoken statements and threats, manifestos, e-mail messages, texting and videotaped proclamations. Focusing on this kind of immediate objective of radicalization among lone wolves, rather than on their underlying grievances, may sharpen our focus on the dangers posed by lone wolf terrorism.

Indiana State University, 2015. 28p.

By Christian Kaunert, Alex MacKenzie, and Sarah Léonard

After the death of Osama Bin Laden and the demise of Al Qaeda, the EU is increasingly threatened by new jihadi terrorist groups such as ISIS, as exemplified by recent terror attacks on Paris, Brussels, Nice, Berlin and Manchester. This book investigates the role of the EU in dealing with such groups as part of its counter-terrorism efforts, by outlining the increasing role of the EU as an external counter-terrorism actor.

Cheltenham, UK: Edward Elgar Publishing, 2022. 192p.

By Institute for Economics & Peace IEP

This is the ninth edition of the Global Terrorism Index (GTI). The report provides a comprehensive summary of the key global trends and patterns in terrorism over the last decade. The calculation of the GTI score takes into account not only deaths, but also incidents, hostages, and injuries from terrorism, weighted over a five-year period. The GTI report is produced by the Institute for Economics & Peace (IEP) using data from TerrorismTracker and other sources. TerrorismTracker provides event records on terrorist attacks since 1 January 2007. The dataset contains over 60,500 terrorist incidents for the period 2007 to 2021.

Sydney: IEP, 2022. 99p.

By Jeffrey William Lewis

"The only comprehensive history available of suicide bombing from its origins in Imperial Russia to the current day, The Business of Martyrdom examines the bombers, their societies, and the organizations that train and sponsor them. Writing for a broad audience, Lewis draws on the history and philosophy of technology in order to explain the evolution and diffusion of suicide bombing across time and from region to<span class='showMoreLessContentElement' style='display: none;'> region. Lewis presents a model for suicide bombing that integrates individual psychology, organizational motivations, and social support. He argues that suicide bombing is a technology that has been invented and re-invented at different times in different areas, but always for the same purpose: resolving a mismatch in military capabilities between antagonists by utilizing the available cultural and human resources."

Annapolis, MD: Naval Institute Press, 2012. 368p.

By V.G. Julie Rajan

Women Suicide Bombers explores why cultural, media and political reports from various geographies present different information about and portraits of the same women suicide bombers. The majority of Western media and sovereign states engaged in wars against groups deploying bombings tend to focus on women bombers' abnormal mental conditions; their physicality-for example, their painted fingernails or their beautiful eyes; their sexualities; and the various ways in which they have been victimized by their backward Third World cultures, especially by "Islam." In contrast, propaganda produced by rebel groups deploying women bombers, cultures supporting those campaigns, and governments of those nations at war with sovereign states and Western nations tend to project women bombers as mythical heroes, in ways that supersedes the martyrdom operations of male bombers.

London: Routledge, 2012. 400p.

Edited by Diego Gambetta

This book attempts to shed light on suicide missions and provide answers to the questions we all ask. Are these the actions of aggressive religious zealots and unbridled, irrational radicals or is there a logic driving those behind them? Are their motivations religious or has Islam provided a language to express essentially political causes? How can the perpetrators remain so lucidly effective in the face of certain death? And do these disparate attacks have something like a common cause? It focuses on four main instances: the Kamikaze, missions carried out by the Tamil Tigers in the civil war in Sri Lanka, the Lebanese and Palestinian groups in the Middle East, and the al-Qaeda 9/11 attack on the World Trade Center and the Pentagon. For more than two years, the authors have pursued an unprejudiced inquiry, investigating organizers and perpetrators alike of this extraordinary social phenomenon. Close comparisons between a whole range of cases raise challenging further questions: If suicide missions are so effective, why are they not more common? If killing is what matters, why not stick to ‘ordinary’ violent means? Or, if dying is what matters, why kill in the process?

Oxford, UK: New York: Oxford University Press, 2005. 452p.

By Talal Asad

Like many people in America and around the world, Talal Asad experienced the events of September 11, 2001, largely through the media and the emotional response of others. For many non-Muslims, "the suicide bomber" quickly became the icon of "an Islamic culture of death"—a conceptual leap that struck Asad as problematic. Is there a "religiously-motivated terrorism?" If so, how does it differ from other cruelties? What makes its motivation "religious"? Where does it stand in relation to other forms of collective violence?

Drawing on his extensive scholarship in the study of secular and religious traditions as well as his understanding of social, political, and anthropological theory and research, Asad questions Western assumptions regarding death and killing. He scrutinizes the idea of a "clash of civilizations," the claim that "Islamic jihadism" is the essence of modern terror, and the arguments put forward by liberals to justify war in our time. He critically engages with a range of explanations of suicide terrorism, exploring many writers' preoccupation with the motives of perpetrators. In conclusion, Asad examines our emotional response to suicide (including suicide terrorism) and the horror it invokes.

On Suicide Bombing is an original and provocative analysis critiquing the work of intellectuals from both the left and the right. Though fighting evil is an old concept, it has found new and disturbing expressions in our contemporary "war on terror." For Asad, it is critical that we remain aware of the forces shaping the discourse surrounding this mode of violence, and by questioning our assumptions about morally good and morally evil ways of killing, he illuminates the fragile contradictions that are a part of our modern subjectivity.

New York: Columbia University Press, 2007. 138p.

By Mark S. Hamm

Today, there are thousands of followers of non-Judeo-Christian faith groups in American correctional institutions. Research suggests that many of these prisoners began their incarceration with little or no religious calling, but converted during their imprisonment. According to the FBI, some of these prisoners may be vulnerable to terrorist recruitment. The purpose of this research is three-fold: (1) to collect baseline information on nontraditional religions in United States correctional institutions; (2) to identify the personal and social motivations for prisoners’ conversions to these faith groups; and (3) to assess the prisoners’ potential for terrorist recruitment. The study creates a starting point for more in-depth research on the relationship between prisoners’ conversion to nontraditional religions and extremist violence. The work is organized into five chapters. Chapter 1 presents a comprehensive review of the literature bearing on the research objectives. This includes an historical overview of Moorish Science Temple and the Nation of Islam, American versions of Islam that have played an important role in radicalizing prisoners through religious identity. The review shows that there are currently opposing views about Islam in prison. One side of the debate takes the position that the Muslim faith offers prisoners a viable path to rehabilitation. The opposing view claims that Islamic prisoners are a threat to U.S. security. Criminological evidence shows that the greatest danger to security is found in mutating forms of “Prison Islam.” Other evidence indicates that the threat emanates from dozens of high-profile terrorists who are already serving lengthy sentences in American correctional facilities.

Terre Haute, IN: Department of Criminology, Indiana State University, 2007. 129p.

By Roger Douglas

Roger Douglas compares responses to terrorism by five liberal democracies—the United States, the United Kingdom, Canada, Australia, and New Zealand—over the past 15 years. He examines each nation's development and implementation of counterterrorism law, specifically in the areas of information-gathering, the definition of terrorist offenses, due process for the accused, detention, and torture and other forms of coercive questioning.

Douglas finds that terrorist attacks elicit pressures for quick responses, often allowing national governments to accrue additional powers. But emergencies are neither a necessary nor a sufficient condition for such laws, which may persist even after fears have eased. He argues that responses are influenced by both institutional interests and prior beliefs, and complicated when the exigencies of office and beliefs point in different directions. He also argues that citizens are wary of government's impingement on civil liberties and that courts exercise their capacity to restrain the legislative and executive branches. Douglas concludes that the worst antiterror excesses have taken place outside of the law rather than within, and that the legacy of 9/11 includes both laws that expand government powers and judicial decisions that limit those very powers.

Ann Arbor, MI: University of Michigan Press, 2014. 337p.

Edited by Diego Muro

Building resilience to violent extremism has become a matter of great concern for European cities that have experienced attacks or that fear experiencing them in the future. Mayors, municipal leaders and other local authority representatives are leading efforts to empower city governments across the EU and develop pragmatic and non-ideological policies. As increasing numbers of citizens rank violent extremism as one of their top worries, urban centres have effectively become the front line of the fight against radicalisation. It is in European cities where transnational extremist threats take shape in the forms of hate speech, recruitment networks, radical cells and terrorist attacks, and it is also in European cities where evidence-based plans to counter and prevent violent extremism at local level need urgently to be devised. Cities are obvious settings in which to implement the motto “think globally and act locally”.

Barcelona: Barcelona Centre for International Affairs, 2017. 118p.

By Peter Neumann

The Internet has revolutionized the way all of us communicate and do business. Its benefits to people everywhere have been enormous and will continue to drive progress in practically every area of life. At the same time, it should be recognized that, while being a force for good, the Internet has also come to play an important—and, in many ways, unique—role in radicalizing homegrown and domestic terrorists. Supporters of Al Qaeda, Sovereign Citizens, white supremacists and neo-Nazis, environmental and animal liberationists, and other violent extremist groups all have embraced the Internet with great enthusiasm and vigor. They are using it as a platform to spread their ideas, connect with each other, make new recruits, and incite illegal and violent actions. We believe that this trend will continue and that future terrorist attacks against the United States and its interests will involve individuals who have been radicalized—at least in part—on the Internet. As a result, countering online radicalization should continue to be a major priority for the government and its Countering Violent Extremism (CVE) efforts. The purpose of this report is to equip policy makers with a better understanding of how the Internet facilitates radicalization, in particular within the United States; an appreciation of the dilemmas and trade-offs that are involved in countering online radicalization within the United States; and ideas and best practices for making the emerging approach and strategy richer and more effective

Washington, DC: Bipartisan Policy Center’s National Security Preparedness Group (NSPG). 2012. 56p.

By Peter Neumann

Last September, we released a report, Assessing the Terrorist Threat, on the evolving nature of this threat to the United States. We concluded that the U.S. government had not adequately addressed the radicalization of homegrown terrorists. We set forth several pressing policy questions, including the fundamental question of who within the government is responsible for identifying radicalization and interdicting attempts at recruitment. This report seeks to answer those questions and provide concrete policy recommendations for a counter-radicalization strategy – the elements of which should be implemented not just by the federal government, but by state and local officials and community organizations.

Washington, DC: Bipartisan Policy Center’s National Security Preparedness Group (NSPG), 2011. 56p.

By Mohammed Abu-Nimer

The emergence of “violent extremism” (VE)2 as a central framework and priority adopted by most Western and non-Western government agencies. It has become the primary lens through which to describe many of their activities, especially in conflict areas around the world, even when the issues are not or are only remotely related. There is no doubt that VE narratives, especially those promoting violence in the name of Islam spread by groups such as Al-Qaeda, Al-Shabab, Taliban and Daesh, have gained strength and visibility in the last two decades (regardless of the differences in the groups’ motivation or type of justification – be it nationalism, anti-Western intervention or religion). However, it is an overstatement to solely explain the motivation for endorsing or adopting VE in Muslim societies as a result of theological factors; as explained below, there are many other factors besides religious identity and theological reasoning contributing to the phenomenon. Nevertheless, it is possible to trace historical factors that led to the creation of such groups in predominantly Muslim countries. In Afghanistan, for example, one such factor is rooted in the Cold War dynamics between the United States (US) and the USSR at the time of the Soviet invasion of Afghanistan in 1979. To fight communism, the US government mobilised local Afghan communities, which included some fighters who subsequently employed extreme Islamic religious narratives. The US’s fervent desire to prevent the spread of communism thus led to the arming of members of Afghan society who later utilised the concept of jihad against non-believers in certain Sunni interpretations.

Berlin: Berghof Foundation, 2018. 21p.

Edited by Beatrix Austin and Hans J. Giessmann

Is the topic of violent extremism slowly turning into one on which everything has already been said, but not yet by everyone, as Karl Valentin used to wryly remark? We do not think so. While violent extremism (VE) has indeed emerged as a new buzzword and a strong funding trend over the past few years, effective strategies for addressing the phenomenon are still being forged and need to be reviewed and tested. Violent extremism’s manifestations range widely: from foreign fighters via terrorist attacks to increasingly public violence-condoning ideology and rhetoric of both secular and religious provenance. How to deal with violent extremism, and its protagonists, is therefore also becoming a major challenge for peacebuilders and conflict transformation practitioners. What specific advantages can a “transformative lens” bring – one which applies insights and learning from the peacebuilding and conflict transformation fields?

Berlin: Berghof Foundation, 2019. 98p.

By Vidhya Ramalingam

Far-right extremism remains a worrying problem across Europe. The most visible cases are those that hit the headlines, such as the discovery of the National Socialist Underground in Germany or Anders Behring Breivik’s attacks in Norway. In the past decade, both Hungary and Sweden were hit by a string of serial murders of Roma and ethnic minorities. Though attacks of this magnitude and scale remain rare, they are not unheard of. In some cases, those personally touched by these violent attacks are still fighting for justice. While high-profile and high-impact events hit the headlines, the bulk of the threat posed by the far right is felt through smaller-scale localised harassment, bullying and hate crime by extremists targeting minority communities. These kinds of incidences often go undetected, and indeed they are hard to quantify. They manifest in the sectioning off of some local areas as no-go zones for ethnic minorities, graffiti of far-right symbols on mosques and synagogues, or threats received by individual members of the community. Those carrying out these actions – far-right extremists – are a broad group, ranging from less ideological youth street gangs to neo-Nazi terrorist cells, anti-Islam activists and registered political parties. Though they differ in their aims and methods, there are some defining features: racism, xenophobia, ultra-nationalism and authoritarianism.

London: Institute for Strategic Dialogue, 2014. 77p.

By F. Cilluffo, G.B. Saathoff, et. al

Savvy use of the Internet has empowered terror networks to expand their reach beyond national borders by enabling wide distribution of a compelling message and social connectivity with new audiences. Use of computer-mediated communication (CMC) has made a range of terrorist operational activities cheaper, faster, and more secure, including communications, fundraising, planning and coordination, training, information gathering and data mining, propaganda and misinformation dissemination, and radicalization and recruitment. The list is long, and not even complete. Before the Internet, terrorists seeking to communicate with one another through electronic means used telephones or radios, which could be tapped. Terrorists seeking to offer training meant congregating trainers and trainees in a fixed training location, exposing the group to capture or worse. Terrorists or their supporters engaged in fundraising or recruitment often pursued these aims in public settings. And terrorists researching a potential target often did so at public libraries and bookstores, subjecting them to surveillance in these public spaces. Now, with the Internet, all of these same activities can be conducted in relative anonymity from safe locations across the globe.

Washington, DC: Homeland Security Policy Institute, The George Washington University; Charlottesville, VA: The Critical Incident Analysis Group (CIAG) University of Virginia School of Medicine, 2007. 34p.

By Brian Michael Jenkins

The U.S. homeland faces a multilayered threat from terrorist organizations. Homegrown jihadists account for most of the terrorist activity in the United States since 9/11. Efforts by jihadist terrorist organizations to inspire terrorist attacks in the United States have thus far yielded meager results. No American jihadist group has emerged to sustain a terrorist campaign, and there is no evidence of an active jihadist underground to support a continuing terrorist holy war. The United States has invested significant resources in preventing terrorist attacks, and authorities have been able to uncover and thwart most of the terrorist plots. This Perspective identifies 86 plots to carry out terrorist attacks and 22 actual attacks since 9/11 involving 178 planners and perpetrators. Eighty-seven percent of those planners and perpetrators had long residencies in the United States. Only four of them had come to the United States illegally, all as minors. Nationality is a poor predictor of later terrorist activity, and vetting people coming to the United States, no matter how rigorous, cannot identify those who radicalize here. Determining whether a young teenager might, more than 12 years later, turn out to be a jihadist terrorist would require the bureaucratic equivalent of divine foresight.

Santa Monica, CA: RAND, 2017. 98p.

By Lynn M. Wright

The domestic terrorist threat in the United States is active and complex, with ongoing threats from violent left- and right-wing extremist groups, and radicalization and recruitment efforts by international terrorist groups. In response, domestic intelligence agencies, at all levels of government, have instituted reforms and improvements since 9/11, but there are still gaps in information-sharing and community engagement. For example, a review of the Boston Marathon bombings uncovered that important risk-based information was not shared with local law enforcement. Concerning domestic terrorism, the United States may, once again, be failing to “connect the dots.” This thesis synthesizes existing studies, reports, and expert testimony concerning domestic terrorism and the roles of domestic intelligence agencies, law enforcement, and the public, and proposes the development and implementation of a formal, national counterterrorism (CT) doctrine. The CT doctrine, in conjunction with a counter radicalization strategy, should focus on bottom-up intelligence/information-sharing, training to strengthen and focus intelligence collection efforts, and culturally sensitive and engaging messaging on social media and the Internet to counter extremist propaganda.

Monterey, CA: Naval Postgraduate School. 2014. 116p.

By Jerome P. Bjelopera

The emphasis of counterterrorism policy in the United States since Al Qaeda’s attacks of September 11, 2001 (9/11) has been on jihadist terrorism. However, in the last decade, domestic terrorists—people who commit crimes within the homeland and draw inspiration from U.S.-based extremist ideologies and movements—have killed American citizens and damaged property across the country. Not all of these criminals have been prosecuted under federal terrorism statutes, which does not imply that domestic terrorists are taken any less seriously than other terrorists. The Department of Justice (DOJ) and the Federal Bureau of Investigation (FBI) do not officially designate domestic terrorist organizations, but they have openly delineated domestic terrorist “threats.” These include individuals who commit crimes in the name of ideologies supporting animal rights, environmental rights, anarchism, white supremacy, anti-government ideals, black separatism, and beliefs about abortion

Washington, DC: Congressional Research Service, 2017. 62p.

By Alex P. Schmid

Based on an in-depth literature review, Research Fellow Dr. Alex P. Schmid explores the terms “radicalisation”, “de-radicalisation” and “counter-radicalisation” and the discourses surrounding them. Much of the literature on radicalisation focuses on Islamist extremism and jihadist terrorism. This is also reflected in this Research Paper which explores the relationship between radicalisation, extremism and terrorism. Historically, “radicalism” – contrary to “extremism” – does not necessarily have negative connotations, nor is it a synonym for terrorism. Schmid argues that both extremism and radicalism can only be properly assessed in relation to what is mainstream political thought in a given period. The paper further explores what we know well and what we know less well about radicalisation. It proposes to explore radicalisation not only on the micro-level of “vulnerable individuals” but also on the meso-level of the “radical milieu” and the macro-level of “radicalising public opinion and political parties”. The author reconceptualises radicalisation as a process that can occur on both sides of conflict dyads and challenges several widespread assumptions. The final section examines various counter-radicalisation and deradicalisation programmes. It concludes with a series of policy recommendations.

The Hague: International Centre for Counter-Terrorism, 2013. 105p.