Birmingham City fans were involved in violent scenes at Elland Road.
After their Championship match against Leeds United ended in a 1-0 defeat, Blues supporters clashed with police and stewards.
Here’s a rundown of what we know so far.
Footage of the violence has been shared on social media. Here’s a video of some of the scenes.
Photos from the away end
These pictures were captured of Blues fans at the end of the match
Arrests and injuries confirmed
Police confirmed 11 arrests were made, mainly for public order offences.
Some stewards suffered minor injuries during scenes described by a police chief as something “no-one would wish to see.”
Now Leeds District Police are appealing for witnesses following disorder incidents inside and outside the ground after the fixture.
These included a public order incident in the Birmingham City supporters stand at the end of the game and a subsequent public order incident in the coach park outside Elland Road.
Police resources were deployed outside the ground between supporters during the incident which lasted for about 45 minutes before fans dispersed.
What the Blues boss said
Asked about the shocking scenes at the end of the match, Blues manager Pep Clotet said: “Of course you don’t want violence in the game anywhere. I just hope that no-one is hurt and calmed down as much as possible. You come to football to enjoy it and have a good day.”
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What the police said
Chief Inspector Jon Arrowsuch, Match Commander of the event, said: “Our enquires are ongoing into the incidents which took place at this afternoon’s game.
“Police resources were deployed outside Elland Road and officers made 11 arrests in total for offences both inside and outside the ground. Clearly these were scenes no-one would wish to see and we will be examining CCTV footage and working with both clubs as we investigate what took place.
“Anyone who has information about public order offences committed is asked to contact Leeds District Police on 101 referencing Police log 531 of October 19.”