Fans were made to wait before the game.
Impatient Bayern Munich fans allegedly left many injured, some seriously when they attempted to storm Schalke’s stadium on Saturday.
The scuffle, branded as an “extremely violent attack” by police took place as access to the stadium had been severely delayed because of body searches at the gates in the aftermath of last week’s attack on the Stade de France in Paris.
Fans had been advised to arrive earlier for the game because of the increased measures.
Gelsenkirchen police say in a statement “only a swift and consequent intervention by police forces prevented worse. Several dozen from this violent group of people are being held.”
Bayern chairman Karl-Heinz Rummenigge says the club distances itself “in every form from these so-called supporters of our club.”
Rummenigge adds “violence cannot and should not ever be tolerated. It’s absolutely inexplicable to me and to all of us how someone, especially now after the terrible events in Paris, can be so lacking in respect for society and football.”
Rummenigge also apologised to Schalke and the victims.
Bayern Munich defeated Schalke 3-1 during their visit on Sunday as they progressed unchallenged on top of the Bundesliga.
Supporters of second-division Bochum were also involved in the rioting, police said.
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