Numerous studies have investigated the prediction of acute and long term posttraumatic symptoms following traumatic exposure. As a result several factors have been shown to be predictive of Acute Stress Disorder (ASD) and Posttraumatic Stress Disorder (PTSD) respectively. Furthermore, research suggests a strong relationship between ASD severity and subsequent PTSD severity. However, little is known in relation to whether there are common pathways to the development of ASD and PTSD. Peritraumatic responses to trauma are found to be associated with both the development of ASD and PTSD. Although research indicates that the interplay between these peritraumatic responses and their combined effect on the development of posttraumatic symptoms is complicated, they may point to a common path to posttraumatic stress. Thus, this study implements structural equation modeling to examine the role of peritraumatic factors such as symptoms of tonic immobility, panic, and dissociation on the development of ASD (N = 458) and PTSD (n = 378) symptoms in a national study of Danish bank robbery victims. The estimated ASD rate was 11.1 % (n = 41) and the estimated PTSD rate was 6.2 % (n = 23). The results are presented and discussed in relation to existing research.