The driver shot himself after ploughing into people outside a restaurant in the city of Muenster.
What is known about incident?
A vehicle, reportedly a grey VW van, was driven into a restaurant terrace area at 15:27 local time (14:27 BST) on Saturday.
Eyewitnesses said it was driven at speed and photographs of the aftermath showed tables and chairs strewn across the popular tourist square.
An employee at one of the cafes told local media that she heard a bang and people screaming.
“I’m angry – it’s cowardly to do something like this,” she told German television channel N24.
The suspect’s motive and exact identity still remains unclear, but German media reported he was a national with mental health problems.