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On 22 July 2011, Norway was struck by two terror attacks. Seventy-seven people were killed, and many injured. Rescue workers from five occupational groups and unaffiliated volunteers faced death and despair to assist victims.To investigate the level of, and associations between, demographic variables, exposure and work-related variables and post-traumatic stress symptoms (PTSS).A cross-sectional study of general and psychosocial health care personnel, police officers, firefighters, affiliated and unaffiliated volunteers were conducted ~10 months after the terror attacks. The respondents answered a self-reported questionnaire. Post-traumatic stress disorder (PTSD) Checklist – specific (PCL-S) assessed PTSS.There were 1790 participants; response rate was 61%. About 70% of the professional rescue workers had previous work experience with similar tasks or had participated in training or disaster drills. They assessed the rescue work as a success. Firefighters and unaffiliated volunteers reported more perceived threat compared with the other groups. Among the professional personnel, the prevalence of sub-threshold PTSD (PCL 35–49) was 2% and possible PTSD (PCL ≥ 50) 0.3%. The corresponding figures among the unaffiliated volunteers were 24% and 15%, respectively. In the multivariate analysis, female gender (β = 1.7), witnessing injured/dead (β = 2.0), perceived threat (β = 1.1), perceived obstruction in rescue work (β = 1.6), lower degree of previous training (β = −0. 9) and being unaffiliated volunteers (β = 8.3) were significantly associated with PTSS.In the aftermath of a terror attack, professional rescue workers appear to be largely protected from post-traumatic stress reactions, while unaffiliated volunteers seem to be at higher risk.