The suspected driver has been arrested, according to police. According to information from the German Press Agency (dpa), the man is injured and in the hospital. He is said to be a German citizen. Currently, police do not believe there were any accomplices, as the dpa learned from security sources.
https://www.handelsblatt.com/politik/deutschland/mannheim-auto-in-menschenmenge-gefahren-laut-sicherheitskreisen-zwei-tote/100111131.html