The goals of this study were to estimate the lifetime prevalence of traumatic events, the current prevalence of Posttraumatic Stress Disorder (PTSD), and the connection between the kinds of traumatic events experienced and the probability of developing PTSD in three study samples in Sarajevo, Bosnia‐Herzegovina, three years after the end of the war. A total of 311 people surviving the siege of Sarajevo were assessed with the Checklist for War Related Experiences (CWE) and an adapted version of the Posttraumatic Diagnostic Scale (PDS). The study groups consisted of a randomly selected residents sample (n = 98), a group of individuals in psychological treatment (n = 114), and a group in medical treatment (n = 99). Each individual survived an average of 24 traumatic events. According to the Diagnostic and Statistical Manual of Mental Disorders, 4th ed. (DSM‐IV; American Psychiatric Association, 1994) criteria, 18.6% of individuals in the residents sample, 32.7% of those in medical treatment, and 38.6% of those in psychological treatment developed PTSD. © 2003 Wiley Periodicals, Inc. J Clin Psychol 59: 41–55, 2003.