"Returning to work routines following any violent incident at the workplace can be very challenging. Even after the work area is secured, and victims or perpetrators are no longer present, emotional reactions and distress may reduce concentration, motivation, and performance. However, there are steps you can take to reduce the negative impact of your traumatic experience. The first requirement for individual and office recovery after violence is assuring safety. You should know that victims, intended victims, colleagues and bystanders may experience significant emotional distress whether or not they were physically injured. People closest to the event or those with close relationships to the victim(s) or perpetrator(s) will likely be most affected. For the majority of people the cornerstone of emotional recovery is talk. You can help yourself and your colleagues by talking with them. When you demonstrate your willingness to discuss the event and your own emotions you help others do so. Some people will not want to participate in group discussions. If you are very uncomfortable in group settings it is important to be able to speak one-to-one to a supervisor. After workplace violence many supervisors have an 'open door policy' to allow this to happen. Since a sense of 'normalcy' and a return to normal work schedules and routines helps most people adjust after violence, your supervisors will encourage this. A sense of normalcy occurs gradually. The more traumatic and dramatic the event, the more likely that people will be emotionally affected, and these memories and reactions will only gradually fade. Most people move on to integrate a tragedy or otherwise significant event into their consciousness without continuing mental distress or disability. The actions below will help you develop a sense of safety and speed return to normalcy."
Center for the Study of Traumatic Stress: http://www.centerforthestudyoftraumaticstress.org