West Ham United have threatened to hand a life ban to any fans found to be involved in anti-Semitic behaviour, following the emergence of a video of a chant on a train.

The short clip, which appeared on social media yesterday, appears to show fans on board an Abellio Greater Anglia train on the way to the Hammers’ clash with Tottenham Hotspur - a team with a large historic Jewish following.

The offensive chant includes the words, “I’ve got a foreskin, how about you? F***ing Jew.”

A spokesman for the club said that it had emailed every supporter with a ticket to the London derby ahead of the game “to remind them that they were acting as ambassadors for West Ham United.”

He added: “If any individual is found to have behaved in an inappropriate way, the Club’s simple, zero-tolerance policy dictates that they will face the strongest possible action, including the option of a life ban from the Boleyn Ground.”

British Transport Police confirmed it is aware of the footage, saying: ““We are encouraged the public has the confidence to report incidents of football-related inappropriate and offensive behaviour to us.

“Officers ask anyone who has information or footage on this latest incident on a train, said to be in north London, or any others, to contact us so the matter can be fully investigated by detectives.”

The footage comes after Chelsea fans were filmed pushing a black man off a train in Paris and shouting racist chants in St Pancras last week.

West Ham supporters released a video mocking their London rivals, showing them welcoming a black man onto a train.

British Transport Police urge anyone with information on yesterday’s incident, or with footage, to get in touch by calling 0800 405040, or by text, on 61016, quoting reference 420 of 22/2/15.