This is the shocking moment a woman appears to bite another passenger during a furious row on the Tube.

Footage has emerged online showing the two passengers hurling abuse during an unexplained argument on the Victoria Line.

The start of the video shows a man apparently pushing a woman, who then appears to lunge her head towards his arm.

She then appears to bite the man on the arm through the jacket he is wearing, before the pair push and shove one another as they approach King’s Cross Station while shocked passengers look on.

As the train arrives at the station, the pair complain to London Underground staff. The man shows off a wound where the alleged bite appears to have punctured his skin through his clothes.

The footage was posted on YouTube in July last year, but police said they had no record of it.

Detectives have now launched an appeal to track down those involved in the altercation.

A British Transport Police spokesman said: "We believe this incident took place on a London Underground train near Kings Cross St Pancras station and we’re keen to hear from any of the people involved.

“We are currently working to establish when the incident took place and what offences have occurred.

“Everyone has the right to travel without fear of abuse or threatening behaviour and BTP takes this type of offence extremely seriously.”

Anyone with information is asked to call police on 0800 40 50 40 or text 61016, quoting the reference 274 of 25/06/2014.