Berlin: Several people were killed when a vehicle drove into a crowd in the western German city of Muenster on Saturday, police said.
"There are several dead, probably including the suspect," a police spokeswoman said.
A security source added: "The scenario is such that an attack cannot be ruled out."
Police tweeted on Saturday afternoon that residents should "avoid the area near the Kiepenkerl pub" where a large-scale police operation is underway. Kiepenkerl is a popular bar in the city's historic downtown area.
It was not clear whether the incident in the western German city of Muenster was an attack.