Three people have been killed following a shooting on a tram in the central Dutch city of Utrecht.
Five others were injured in the incident, which police say appears to be a terrorist attack.
Police are looking for a 37 year-old Turkish man named as Gokmen Tanis and have warned people not to approach him.
Schools have closed and security has been increased while counter-terrorism police work to find the gunman.
The incident follows Friday's attack at two mosques in New Zealand which left 50 people dead.