Several people were shot in a “very serious incident” in the Dutch city of Dordrecht on Monday evening, Dutch officials said.
Details of the incident were not immediately available and it was not clear if they had been killed.
Dordrecht mayor Wouter Kulf said on Twitter that it was a “very serious shooting incident” and that he was heading to the scene.
Police could not confirm local media reports that three people were killed in the city near the port city of Rotterdam.
Police said emergency response teams were on the scene to help the injured and investigate the shooting.