Police confirmed there had been casualties but did not immediately say what happened, reports PTI.
Several people have been been killed in the city of Muenster, in western Germany after a van drove into pedestrians.
The DPA news agency said a vehicle hit bystanders in the western city.
The Reuters news agency has reported German police saying "there are several dead, probably including the suspect", with around 30 people injured.
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Police tweeted Saturday afternoon that residents should "avoid the area near the Kiepenkerl pub" where a large-scale police operation is underway.
"Some people have died and some have been injured", police wrote on Twitter.
Authorities are treating incident as terror attack, according to media reports. It showed pictures of where police had cordoned off an area of the city.