In the Ruhr area, a traffic control of the police escalated: Actually, only an apparently drunken driver in Mülheim an der Ruhr should be checked - but then gathered on the road around 50 people and behaved aggressively, as the police said in the night of Saturday.

The officials then called for reinforcement. Four of the participants were arrested during the action on Friday. The men had made some significant resistance, police said.