On Saturday, a driver rammed into pedestrians in the German city of Heidelberg, injuring several people.
Police officers stand guard near the attacked Christmas market in Berlin, capital of Germany, on December 21, 2016.
One of the three victims was seriously injured, a police spokeswoman said.
He is now in a hospital in Heidelberg, the police statement said.
The man, who is believed to have been carrying a knife, then got out of his rental vehicle, another police spokesman, Norbert Schaetzle, told n-tv television.
The man, who is believed to have been carrying a knife, got out of his rental auto, another police spokesman, Norbert Schaetzle, told n-tv television.
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Mr Schaetzle added that the man is not suspected to be a terrorist.
German daily Bild reported that the suspect was suffering from psychiatric troubles, but authorities have made no comment on that claim.
The suspect is thought to have driven the auto into crowds and injured three people before fleeing the vehicle.
The incident comes two months after an attacked drove a lorry through a busy Christmas Market in Berlin.
Germany has been shocked by a spate of attacks claimed by the Islamic State terror group, and some foiled plots, that a growing right-wing populist movement has blamed on the open-door refugee policy of Chancellor Angela Merkel.