Lone threats: a register-based study of Swedish lone actors

Amir Rostami, Hernan Mondani, Christoffer Carlsson, Jerzy Sarnecki, Christofer Edling, Joakim Sturup

Research output: Contribution to journalArticlepeer-review


This study investigates 30 lone actors in Sweden with a register-based design using a group of male lone actors and two reference groups: same-sex siblings and other male violent extremists. We compare lone actors to the reference groups along social background, criminal background, and co-offending relations (1995 –2016), and mental health (1980–2016). Our results show that lone actors are primarily born in Sweden to two Swedish-born parents. They have a high degree of criminality and co-offending, indicating that they are not completely loners in their criminal behaviour. They have higher enrolment in secondary education than the reference groups, but lower enrolment in higher education than other male violent extremists. Additionally, they suffer considerably more from mental disorders compared to the reference groups. An analysis of criminality and in- and outpatient hospitalisation over the life course indicates that lone actors may have had problems in their transition into middle age.
Original languageEnglish
JournalInternational Journal of Comparative and Applied Criminal Justice
Publication statusE-pub ahead of print - 2022 Jul 17

Subject classification (UKÄ)

  • Law and Society
  • Social Psychology
  • Sociology (excluding Social Work, Social Psychology and Social Anthropology)


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