RT Article T1 Lone threats: a register-based study of Swedish lone actors JF International journal of comparative and applied criminal justice VO 48 IS 1 SP 75 OP 94 A1 Rostami, Amir A2 Mondani, Hernan A2 Carlsson, Christoffer 1986- A2 Sarnecki, Jerzy 1947- A2 Edling, Christofer 1966- A2 Sturup, Joakim 1980- LA English YR 2024 UL https://krimdok.uni-tuebingen.de/Record/1878566326 AB 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. K1 crime network K1 Co-offending K1 Violent Extremism K1 lone wolves K1 Lone actors DO 10.1080/01924036.2022.2100802