Police say 15 people were arrested and several injured in clashes between officers and violent supporters of Dynamo Dresden during a German Cup match at Borussia Dortmund on Tuesday.

Dortmund won 2-0 to advance to the third round.

Dresden’s supporters clashed with police before, during and after the match.

The game was briefly interrupted several times when Dresden fans threw firecrackers and flares onto the field. The clashes came as German police reported that the number of people injured in violence at matches in the top two divisions last season reached a 12-year-high.