Several people have been reported dead following an incident in the western German city of Muenster on Saturday in which a driver plowed a vehicle into a group of people. Up to 30 people are reported injured.

“There are several dead, probably including the suspect,” said a police spokeswoman.

A security source told Reuters, “The scenario is such that an attack cannot be ruled out.”

Police tweeted 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.

Reuters reported: Mass-selling daily Bild reported in its online edition that three people had died in the incident. It showed pictures of where police had cordoned off an area of the city.

The incident evoked memories of a December 2016 truck attack in Berlin that killed 12 people.

Anis Amri, a failed Tunisian asylum seeker with Islamist links, hijacked a truck on Dec. 19, 2016, killed the driver and then ploughed it into a crowded marketplace, killing 11 more people and injuring dozens of others.