Some football fans attacked police officers and seriously injured two of them after Borussia Dortmund's 4-0 Bundesliga win over relegated Darmstadt on Saturday.
A 26-year-old woman was injured with a kick and a 33-year-old man sustained a shoulder injury, according to the police.
The sold-out football match in the stadium was calm, but groups of fans clashed in the car park afterwards. Some masked Darmstadt fans attacked the police officers, including by throwing bottles.
The two seriously injured officers were hospitalized.
The attacker of the policewoman was reportedly found in a bus, while the attacker of the police officer escaped without being recognized.
Four suspects aged between 20 and 30 are now facing criminal charges for offences including breach of the peace and assault on law enforcement officers.