By the U.S. Federal Bureau of Investigation, Lauren Richards, Peter Molinaro, John Wayne. et al.

Operationally defining the lone offender terrorist is challenging, as the nature of terrorism is both highly political and contextually dependent. Over the years, there has been disagreement over the classification of violent acts under the label of “terrorism.” While an argument can be made that the infliction of fear upon a targeted group or the public is sufficient to classify an act as terrorism, the FBI definition of terrorism requires a purported motivation that goes beyond exclusively personal motivations and attempts to influence change in furtherance of extremist ideologies of a social, political, religious, racial or environmental nature. The focus of the current study examined offenders who carried out their attacks independent of any direction from a terrorist group or organization.Lone offender terrorism continues to pose a threat as violent ideological groups and terrorist organizations place emphasis on inspiring lone offender-style attacks. Additionally, individuals who view violence as an accessible and justified method for advancing their own ideological goals can independently mobilize toward violent action. While attacks directly coordinated by terrorist organizations are generally more lethal globally, the United States departs from this trend: lone offender attacks in the United States are more deadly, possibly due to strong U.S. counterterrorism capacity for disrupting.The current report provides an overview of the data, exploring the various topics encompassed within the coding protocol, including bystander observations, offenders’ backgrounds, family and social networks, behavioral characteristics, radicalization, and attack planning. Predicting lone offender terrorism incidents is not possible, but prior research and operational experience support the conclusion that acts of targeted violence, including lone offender terrorist attacks, may be preventable through early recognition and reporting of concerning behavior. The report aims to inform broader goals of enhancing bystander education and awareness, as well to aid the prevention efforts of law enforcement and multi-disciplinary threat assessment teams working to counter targeted violence threats every day. To work toward this objective, the authors examine relevant contextual factors and analyze the statements and behaviors offenders exhibited before carrying out their attacks.

Washington, DC: U.S. FBI, 2019. 80p.

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 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 Raffaello Pantucci

The troublesome question of how and whether to consider what are commonly referred to as Lone Wolf terrorists within the broader roster of terrorist groups is something that has regularly confounded security analysts for a variety of reasons. This article attempts to create some sort of typology to start to define the group, with specific reference to the instances of Lone Wolves (or Lone Wolf Packs, an admittedly paradoxical choice of words that is defined in the article as small, isolated groups of individuals involved in terrorism) who claim to adhere to an extremist Islamist ideology. The article offers four subsets to the definition, drawing upon a detailed analysis of a variety of different plots in Europe and North America: Loner, Lone Wolf, Lone Wolf Pack, and Lone Attacker. The purpose of the article is to offer some preliminary thoughts on the issue of Lone Wolves, and start a process towards deeper understanding and closer analysis of the phenomenon. This is of particular salience given the frequency with which security analysts cite the phenomenon as a threat and the increasing way in which Al Qaeda ideologues refer to it.

London: International Centre for the Study of Radicalisation (ICSR), King's College London, 2011. 63p.