# Posttraumatic Stress Symptoms and Anger Among Police Officers Following a Fatal Knife Attack on a Team Member

## TL;DR

Police officers who knew a colleague killed in a knife attack showed higher stress and anger, highlighting the mental health risks of personal connections to traumatic events.

## Contribution

This study identifies personal acquaintance with a deceased colleague as a key risk factor for mental health issues in police officers after a fatal attack.

## Key findings

- Officers who knew the deceased had significantly higher posttraumatic stress symptoms.
- Deployed officers showed higher trait anger compared to non-deployed officers.
- Childhood emotional neglect was linked to negative cognitions after the incident.

## Abstract

Mental disorders and impairments are part of the occupational risk for emergency personnel. This study examines the impact of a deadly knife attack on police officers’ mental health. Aims: We hypothesized that police officers who knew the deceased team member would report higher levels of psychological distress compared to those who did not, regardless of the deployment status. Methods: Six months after a fatal knife attack in which a police officer was killed, a total of N = 245 officers participated in the study. Of these, n = 115 reported knowing the victim personally, n = 126 did not (n = 78 deployed; n = 176 not deployed), while n = five did not provide any information. Posttraumatic stress disorder (PTSD), posttraumatic stress symptoms (PTSS), anger and adverse childhood experiences (ACEs) were assessed using questionnaires. Chi-square tests examined group differences in probable PTSD prevalence; t-tests assessed differences in anger and Posttraumatic Stress Disorder Checklist for DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition; DSM-5; PCL-5) symptom scores. Linear regression analyses tested deployment, acquaintance with the victim, gender, and childhood emotional neglect as predictors. Results: Police officers who personally knew the deceased colleague exhibited significantly higher PTSS scores. In addition, the deployed group showed significantly higher trait anger than the non-deployed. Acquaintance with the victim and emotional neglect in childhood were significantly related to negative cognitions, whereas deployment to the knife attack or gender were not. Discussion: Police officers with a personal connection to the deceased showed significantly higher mental health impact than those with direct exposure alone, placing them in a higher-risk group due to increased exposure to feelings of guilt and shame due to their professional role. Police officers who were emotionally neglected in their childhood may be more prone to negative cognitions in adulthood, when faced with critical events. These results underline the importance of addressing risk factors in both pre-deployment training and post-event debriefing, especially with regard to anger management after major critical incidents.