A Millwall fan attacked two men at a Tube station, punching one of them in the face, in a "frightening outburst of violence".

British Transport Police have released a CCTV image of a man they'd like to speak to in connection with the the assault at Canada Water station on the evening of April 4.

The victim, a 31-year-old man, was leaving the station with a friend at around 10.30pm when they heard two men behind them singing Millwall songs.

One of the Millwall fans attacked the victim, punching him in the face, as well as assaulting another man who hasn't yet been identified by police.

The attacker is then said to have threatened station staff with further violence when they came over to help the injured victims.

Detective Sergeant Krishan Appannah said: "Fortunately neither victim was seriously injured, but they sustained cuts and bruises in a frightening outburst of violence.

"Such incidents are rare on the Underground and we work hard with our partners at TfL to ensure the Tube remains a safe place for passengers and staff.

"After analysing CCTV and distributing images on police intelligence networks, I am today asking the public for their help.

“I believe the man in the image could have information about this incident. I would urge him or anyone who recognises him to contact BTP.”

Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference 343 of 19/5/16.

Information can also be passed anonymously to the independent charity Crimestoppers on 0800 555 111.