A woman riding on the Metro Blue Line train in Long Beach, California, was caught on camera violently beating a man who allegedly used a racial slur.

The footage, shot by a witness around 7pm on Monday, shows a man who appears intoxicated on the train being kicked in the head and stomped by the irate woman.

The witness alleges the man used several racial slurs against people on the train, including the woman, according to ABC 7.

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A woman was caught on film attacking a man who allegedly called her a racial slur. She is seen here kicking him in the face

In the video footage shot by a witness, the woman is then seen stomping on the man's back after he slumps over

After the man allegedly used a slur against the woman she began attacking him.

In the video she first kicks him in the head and he slumps on his side.

Then, she stands on the seat and begins stomping on the man's back as he begins to slip into the crack of the legroom area.

She continues to pound on him with kicks and stomps until he it completely beneath the seat.

She then takes it even further as she begins jumping on the man's back. He appears to have been knocked out by her kick or too weak to fight back

She stomps on him as a witness pleads with her not to 'kill him'. No one helps the man during the attack

'Don't kill him,' the witness says over and over.

During the entire attack no one comes to the aid of the man.

He writhes on the ground but appears barely able to move or stand. A man can be seen walking past him.

Eventually the woman walks away, too.

The woman eventually kicks the man into the leg room space and continues to kick him. She then walks away leaving him writhing in pain

The witness said eventually someone hit the emergency stop and a train operator was notified.

The man and the woman got off the train before police arrived, the witness said.

The Los Angeles County Sheriff's Department's Transit Bureau is investigating the situation as it works to identify the woman.