Journal of Threat Assessment and Management, Vol 12(1), Mar 2025, 23-44; doi:10.1037/tam0000224
Three types of terrorist attackers, sentenced between 1983 and 2021, were compared using a sample of 143 individuals convicted of extremist offenses in England and Wales. Attackers were classified as either lone actors, lone dyads, or group actors, and these groups were compared in relation to sociodemographics, ideological affiliation, mental health status, online activities, plot characteristics, and assessments of risk. Data were obtained from coding the content of specialist risk assessment reports. Key findings include that lone actors and lone dyads were significantly more likely to present with mental health issues than group actors. Attackers affiliated with the extreme right wing were more likely to commit attacks alone or in pairs, in contrast to Islamist extremists who were more likely to attack as a group. In terms of trends over time, lone-actor attacks have become increasingly prominent, while the opposite is true for group attacks. The internet was also found to play an important role in radicalization pathways and attack preparation for lone actors and lone dyads, but a lesser role for group-based attackers. No differences were found between attacker groups in assessments of risk by professionals. Gaining an increased understanding of those assuming attacker roles can help guide counterterrorism approaches and future policy. (PsycInfo Database Record (c) 2025 APA, all rights reserved)