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ID:
188084
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| Summary/Abstract |
Terrorist attacks carried out by individuals have significantly accelerated over the last twenty years. This type of lone-actor (LA) terrorism stands as one of the greatest security threats of our time. While the research on LA behavior and characteristics has produced valuable information on demographics, classifications, and warning signs, the relationship among these characteristics is yet to be addressed. Moreover, the means of radicalization and attacking have changed over decades. This study conducts an a-posteriori analysis of the temporal changes in LA terrorism and behavioral associations in LAs. We initially identify twenty-five binary behavioral characteristics of LAs and analyze 190 LAs. Next, we classify LAs according to ideology first, incident-scene behavior (determined via a virtual attacker-defender game) secondly, and, finally, the clusters obtained from the data. In addition, within each class, statistically significant associations and temporal relations are extracted using the A-priori algorithm. These associations would be instrumental in identifying the attacker’s type and intervening at the right time. The results indicate that while pre-9/11 LAs were mostly radicalized by the people in their environment, post-9/11 LAs are more diverse. Furthermore, association chains for different LA types present unique characteristic pathways to violence and after-attack behavior.
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| 2 |
ID:
193076
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| Summary/Abstract |
A systematic review of the empirical literature on lone-actor terrorism, the first of its kind, is presented. Across 109 sources, ten main themes that characterize this domain are identified and described: definitions of lone-actor terrorism and typologies; heterogeneity of lone-actor terrorists; presence of mental health issues and/or personality disorders; similarities with other lone-offender criminal types; motivation to act driven by personal and ideological influences; increasing prominence of internet use; ties with other extremists, groups or wider movements; processes of attack planning and preparation; role of opportunity/triggers; and a tendency toward leakage/attack signaling.
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| 3 |
ID:
188025
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| Summary/Abstract |
This article contributes to the growing body of knowledge on lone-actor terrorism with the incorporation of closed-source data. The analyses presented investigate the antecedent behaviors of U.K.-based lone-actor terrorists leading up to their planning or conducting a terrorist event. The results suggest that prior to their attack or arrest the vast majority of lone-actor terrorists each demonstrated elements concerning (a) their grievance, (b) an escalation in their intent to act, (c) gaining capability—both psychologically and technically and (d) attack planning. The results also disaggregate our understanding of lone-actor terrorists in two ways. First, we compare the behaviors of the jihadist actors to those of the extreme-right. Second, we visualize Borum’s (2012) continuums of loneness, direction, and motivation. Collectively the results provide insight into the threat assessment and management of potential lone actors.
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