BERLIN—Police in Germany said they had detained a man after a driver rammed a car into a crowd, leaving at least one dead and several wounded in the latest such incident in recent months. Authorities urged residents to avoid the center of Mannheim,

The police in Mannheim, in the country’s southwest, said that the driver, a 40-year-old German citizen, had been arrested and that they did not believe he had a political motive.

Police in Mannheim, Germany asked people to avoid the downtown area after a vehicle plowed into a crowd near a Carnival season event.