West Midlands Police are investigating pockets of violence during the game between West Bromwich Albion and Millwall on Saturday.
Unsavoury scenes have emerged on social media of violence between the two sets of supporters, thought to be at half-time.
The Mirror is reporting on the violence today and videos can be seen on our sister site that show the fans clashing.
The video appears to show a gate being broken during the brawl. There is no evidence of any police presence to break up or calm the situation down.
One scene appears to show a supporter laid out unconscious, believed to be a Millwall fan. He is quickly tended to by fans who attempt to save him from the ongoing melee.
Bottles are also chucked over the separating barrier, from fans on either side, whilst a separate video shows huge numbers charging towards the fence seemingly in an attempt to force it down.
The match at the Hawthorns finished 1-1, with Daniel Ballard cancelling out Kyle Bartley’s opener. Karlan Grant had earlier missed a penalty for the hosts but the result was enough to send them top of the Championship table.
Chief Inspector Ian Gorman, from West Midlands Police said: “We’re sad to say that there were pockets of fighting at the match on Saturday.
“People found guilty of crimes at fixtures face lifetime match bans as well as the sentences handed down by the courts.
“Anyone who can help our investigation into violence at the West Brom v Milwall game should contact us via Live Chat on our website west-midlands.police.uk.”
A spokesperson from West Brom told The Mirror : “We are aware of an incident which took place during the interval of yesterday’s fixture against Millwall, and a full review has begun in conjunction with West Midlands Police.
“We will work with police and Millwall Football Club to ensure anyone responsible for the disorder receives the appropriate punishment.”
Millwall were contacted for comment by the Mirror .