This is the moment a reveller was brutally assaulted by a woman who accused her of throwing a sandwich at her on the way back from Notting Hill Carnival.

The incident happened on a train travelling from London to Birmingham on Monday night.

The victim and her male companion were approached by a woman asking the pair if they had chucked food at her.

When they denied the act, she told them: 'Don't make me take off my wig. I will punch you into next week!'

A video published to Facebook has gone viral showing the woman violently punching the victim as a hooded man dived in to help, wrestling the second victim to the ground.

In the video, the attacker then takes her wig off and grabs hold of the white woman and repeatedly punches her in the head

One of the alleged victims - a woman wearing a pineapple shirt - initially argued back to the woman.

In the video, the attacker then takes her wig off and grabs hold of the woman and repeatedly punches her in the head.

The alleged victim's companion appears to try and pull the woman off when a hooded man intervenes.

The hooded male then jumped in - pulling the second victim into a headlock and wrestled him to the floor.

The alleged victim's companion appears to try and pull the woman off when a hooded man intervenes

At one stage the female victim cowered in fear as her attacker continued to punch and stamp on her.

Commuters appeared wholly unphazed by the display, with two middle-aged men leaving the carriage rather than helping the victims.

Eventually a fellow passenger intervened. He split up the two woman, who continued arguing.

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British Transport Police said they were aware of the incident but no arrests have been made.

A spokesperson said: 'We are aware of footage circulating on social media showing an assault on board a Chiltern Train.

'We believe it relates to an incident which took place on a train between London and Birmingham Snow Hill at 9.50pm on 27 August.

'An investigation into this incident is underway, no arrests have been made at this time.

'Anyone with information is asked to contact BTP by calling 0800 40 50 40 or texting 61016.'