As more information becomes available, I will update this post:

“The attacker, who was believed to have been armed with a knife, was shot and injured by police in a brief standoff after fleeing the scene on foot.

His motives are unclear, but terrorism is not suspected and he is thought to have acted alone, police say. …

In Heidelberg the attacker drove what is thought to be a rental car into pedestrians in one of the city’s central squares, injuring three people, one of whom is said to be in a serious condition.

He then left the car but was tracked down and shot by police near an old swimming pool. …”