West Midlands Police are investigating pockets of violence during the match between West Bromwich Albion and Millwall on Saturday.
Unsavory scenes have emerged on social media of violence between the two sets of supporters, believed to be at half-time.
The Mirror reports on the violence today and videos can be seen on our sister site which show the fans clashing.
The video appears to show a broken door during the fight. There is no evidence of a police presence to break up or calm the situation.
One scene appears to show a supporter lying unconscious, believed to be a Millwall fan. He is quickly picked up by the fans who try to save him from the ongoing melee.
Bottles are also thrown over the fence, with fans on either side, while a separate video shows a large number of people charging towards the fence, apparently in an attempt to force it.
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The match at the Hawthorns ended 1-1, with Daniel Ballard canceling out Kyle Bartley’s opener. Karlan Grant had previously missed a penalty for the hosts but the result was enough to send them top of the Championship table.
Chief Inspector Ian Gorman, West Midlands Police, said: “We are sad to say there were pockets of fighting in Saturday’s game.
“Video of some of these fights has been uploaded to Facebook and Twitter which we are using along with our own footage and club CCTV to find those responsible.
“Those convicted of crimes in matches face lifetime match bans as well as court-ordered sentences.
“Anyone who can help our investigation into the violence at the West Brom v Milwall game should contact us via live chat on our website west-midlands.police.uk.”
A West Brom spokesman told the Mirror: “We are aware of an incident which occurred during the interval of yesterday’s game against Millwall, and a full review has begun in conjunction with the United Kingdom Police. West Midlands.
“We will work with the police and Millwall Football Club to ensure anyone responsible for the disorder receives the appropriate punishment.”
Millwall have been contacted for comment by the Mirror.