By Julia Kupper and Reid Meloy

This pilot study examines the correlation of online and on-the-ground behaviours of three lone-actor terrorists prior to their intended and planned attacks on soft targets in North America and Europe: the Pittsburgh synagogue shooter, the Buffalo supermarket shooter and the Bratislava bar shooter. The activities were examined with the definition of the proximal warning indicator energy burst from the Terrorist Radicalization Assessment Protocol (TRAP-18), originally defined as an acceleration in frequency or variety of preparatory behaviours related to the target. An extensive quantitative and qualitative assessment of primary and secondary sources was conducted, including raw data from different tech platforms (Gab, Discord and Twitter–now X) and open-source materials, such as criminal complaints, superseding indictments and court trial transcripts. Preliminary findings of this small sample suggest an inverse relationship between the online and offline behaviours across all three perpetrators. The average point of time between the decision to attack and the actual attack was five months, with an elevation of digital activities in the three months leading up to the incident, along with some indications of offline planning. In the week prior to the event, social media activity decreased–specifically on the day before the acts of violence with two subjects going completely dark–while terrestrial preparations increased. On the actual day of the incident, all assailants accelerated their tactical on-the-ground actions and resurfaced in the online sphere to publish their final messages in the minutes or hours prior to the attack. It appears that the energy burst behaviours in the digital sphere and the offline actions can be measured in both frequency and variety. Operational implications of this negative correlation are suggested for intelligence analysts, counter-terrorism investigators and threat assessors.

London: The Global Network on Extremism and Technology (GNET), 2023. 36p.

By Katherine A. Fowler, Rachel A. Leavitt, Carter J. Betz, Keming Yuan & Linda L. Dahlberg

Multi-victim homicides are a persistent public health problem confronting the United States. Previous research shows that homicide rates in the U.S. are approximately seven times higher than those of other high-income countries, driven by firearm homicide rates that are 25 times higher; 31% of public mass shootings in the world also occur in the U.S.. The purpose of this analysis is to examine the characteristics of mass, multiple, and single homicides to help identify prevention points that may lead to a reduction in different types of homicides.

We used all available years (2003–2017) and U.S. states/jurisdictions (35 states, the District of Columbia, and Puerto Rico) included in CDC’s National Violent Death Reporting System (NVDRS), a public health surveillance system which combines death certificate, coroner/medical examiner, and law enforcement reports into victim- and incident-level data on violent deaths. NVDRS includes up to 600 standard variables per incident; further information on types of mental illness among suspected perpetrators and incident resolution was qualitatively coded from case narratives. Data regarding number of persons nonfatally shot within incidents were cross-validated when possible with several other resources, including government reports and the Gun Violence Archive. Mass homicides (4+ victims), multiple homicides (2-3 victims) and single homicides were analyzed to assess group differences using Chi-square tests with Bonferroni-corrected post-hoc comparisons.

Results: Mass homicides more often had female, child, and non-Hispanic white victims than other homicide types. Compared with victims of other homicide types, victims of mass homicides were more often killed by strangers or someone else they did not know well, or by family members. More than a third were related to intimate partner violence. Approximately one-third of mass homicide perpetrators had suicidal thoughts/behaviors noted in the time leading up to the incident. Multi-victim homicides were more often perpetrated with semi-automatic firearms than single homicides. When accounting for non-fatally shot victims, over 4 times as many incidents could have resulted in mass homicide.

Conclusions: These findings underscore the important interconnections among multiple forms of violence. Primary prevention strategies addressing shared risk and protective factors are key to reducing these incidents.

Injury Epidemiology (2021) 8:49

Edited by Jean-Marc Dreyfus and Élisabeth Anstett

This book outlines for the first time in a single volume the theoretical and methodological tools for a study of human remains resulting from episodes of mass violence and genocide. Despite the highly innovative and contemporary research into both mass violence and the body, the most significant consequence of conflict - the corpse - remains absent from the scope of existing research. Why have human remains hitherto remained absent from our investigation, and how do historians, anthropologists and legal scholars, including specialists in criminology and political science, confront these difficult issues? By drawing on international case studies including genocides in Rwanda, the Khmer Rouge, Argentina, Russia and the context of post-World War II Europe, this ground-breaking edited collection opens new avenues of research. Multidisciplinary in scope, this volume will appeal to readers interested in an understanding of mass violence's aftermath.

Manchester, UK: Manchester University Press, 2014. 218p.