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. …”
It is hard to imagine this being anything other than an Islamic terrorist attack, but we shall see. We have been surprised a few times in the past.