A banner with a Kurdish flag led to a police operation with pepper spray and batons during a regional football match between Türkgücü Munich and the Bayern amateurs.
After the operation with a total of 19 injuries, the encounter on Saturday was canceled.
Shortly after the kick-off, a banner reading "FC Bayern Fanklub Kurdistan" was rolled out in the Bayern fans' area, a police spokesman confirmed on Sunday at the request of the German Press Agency.
According to the police, Turkish fans of the host felt provoked by the banner.
The background could be the attack in the metropolis of Istanbul last Sunday, in which six people died and 80 were injured.
The Turkish government blamed the PKK, the banned Kurdistan Workers' Party, and the Kurdish militia YPG.
They deny responsibility.
After requests from Bayern officials and the stadium announcer did not help, the police tried to confiscate the banner using batons and pepper spray.
The police were criticized for the harsh measures on social networks.
Nine fans and ten police officers were injured, police said.
Just two minutes after kick-off, the game was interrupted by the referee for the first time because of arguments between the fans.
The players were sent to the cabins, but returned a little later.
After the police operation, the referee finally stopped the game.
The Bavarian Football Association decides how the game will be rated or whether there will be a repeat.