The mayor of the Dutch city of Utrecht says three people have now died after a shooting on a tram.
Nine people have also been injured, and the country's Prime Minister says authorities are focused on catching the "suspect or suspects."
Police have tweeted a photo of one suspect they are looking for 37 year old Turkish-born Gokman Tanis.
The police asks you to look out for the 37 year old Gökman Tanis (born in Turkey) associated with the incident this morning at the #24oktoberplein in #Utrecht. Do not approach him but call 0800-6070. pic.twitter.com/U1IWEDtUYu
— Politie Utrecht (@PolitieUtrecht) 18 March 2019
The terror alert in the city has been raised to its highest level, as authorities say they're considering a possible terrorist motive, and the gunman is reported to still be on the run.
An apartment near the tram is currently surrounded by police.