The purpose of the proposed research is to pilot a behavioral intervention specifically designed to reduce the symptoms of peritraumatic panic, in order to reduce the likelihood of subsequent PTSD. The investigators have developed the Anxiety Reduction Treatment for Acute Trauma (ARTAT), a one-session intervention targeting at-risk individuals (those continuing to experience peritraumatic panic following a trauma) and enhance self-efficacy. The intervention provides education about common responses to trauma in order to normalize symptoms and teaches individuals anxiety management techniques such as deep breathing and muscle relaxation. ARTAT specifically avoids encouraging people to process the trauma (given evidence that this may enhance arousal).