This is the horrific moment a bully viciously attacks a 13-year-old girl as onlookers urge her to 'kick her in the face'.

Crying, the victim begs the girl to leave her alone after she is punched repeatedly about the head and body.

The footage, filmed at a school in Tamworth, Staffordshire, was taken by sick friends of the attacker who laugh and taunt at her ordeal and encourage the bully to keep going - with one even shouting 'You ain't got her in the face yet'.

A 15-year-old girl has today been arrested by Staffordshire Police in connection with the incident.

A 13-year-old girl was viciously assaulted, pictured, near a school in Tamworth

The victim was dragged around, pictured, by her attacker while a crowd cheered the bully on

Her mother said the girls were 'supposed to be friends' and she cried when she learned her daughter had been attacked

In the footage, uploaded to Snapchat, the girl can be heard shouting at her that she was 'going to get banged' as she repeatedly hits her

Her mother revealed the attacker - who cannot be identified for legal reasons - then shook her daughter's hand following the terrifying assault, and warned her 'not to grass'.

The violent incident happened at Landau Forte Academy on Monday and lasted for a terrifying 25 minutes.

Her mother said: 'The school rang me and told me what happened. I just cried, this girl was supposed to be her friend.

'The video was posted on Snapchat and she saved it as soon as she saw it, which is good as the guy who took it shortly deleted it.

'It's good that everyone is sharing it on Facebook to raise awareness, but it's so upsetting and I don't like watching it. It's just horrible.'

The attack happened next to an underpass near her school just after 3pm on Monday.

The bully also taunts the victim after the latter admitted she was 'scared' and begged her to stop, left and right

The girl was even dragged around by her hair, pictured, as a crowd of boys can be heard laughing

In the video, a girl can be seen repeatedly attacking the victim as a group stand by and jeer.

As she sits in tears on the ground, the girl can be heard saying: 'Stay out of my family's life. Bring s*** into my family, you're getting banged. I told you I was going to bang you.'

When she refuses to stand up to take another beating, the girl says: 'I'll f****** kick you in the head for about an hour.'

She then mocks and taunts her further, asking if she is 'scared' as the teenager shouts back 'yes!'.

The bully then grabs the younger girl's hair and continues to slap and punch her in the head.

Her mother added: 'I don't think the main girl would have done what she did if it wasn't for the boys cheering her on. They were friends.

'It all came about after a rumour was spread around school.'

The victim has been kept away from school and the girl who carried out the attack is believed to have been suspended from Landau Forte Academy.

The victim, pictured, is seen on the floor in tears for most of the footage, pleading with her attacker to stop

She refuses to get up and fight the bully and pleads with her to stop hurting her

A spokesperson for Staffordshire Police said: 'Officers are continuing to support the 13-year-old victim, who was treated in hospital for minor injuries and is now recovering at home.

'She is receiving appropriate support and her family are supportive of our investigation.

'We appreciate footage of the assault is in circulation and it is distressing.

'Officers investigating the incident have seen the footage and it does form part of our investigation.

'We would like to take this opportunity to reassure our communities that such incidents in Tamworth, and Staffordshire as a whole, are rare.

'An increased, visible police presence has been implemented in the Tamworth area to provide reassurance to the local community.

'We are treating this matter seriously and anyone with information is encouraged to contact us on 101, or speak to the officers on patrol.'

Staffordshire Police confirmed an investigation is taking place and the attacker had been 'identified and will be interviewed'

A police van has been seen parked outside the school, while p arents have also expressed their outrage at the attack and demanded the school do more to stamp out bullying.

One parent, who did not want to be named, said: 'I think the boys standing around are just as bad in a way.

'The school doesn't have control over what happens outside the classroom but they should do more educating and disciplining those who make other kids lives hell.

'There is no excuse for this kind of behaviour, if an adult did it then they'd be arrested and dragged through the courts which is exactly what should happen here.'

Another parent added: 'That poor little girl, I'm glad she's ok. I really hope that bully gets what's coming to her.

'I think this is a matter for the police because that wasn't just bullying, that was assault.'

A spokesman for the school condemned the 'disgusting and vicious attack' and said it 'did not hesitate to take the firmest action possible'.

The spokesman said: 'Despite this taking place away from school, we have not hesitated in taking the firmest action possible against those who perpetrated it and those who stood by and encouraged it.