The attack is said to have taken place on a residential rooftop in Nanchang, central China, reported People's Daily Online.

Police are currently investigating the incident, which occurred on September 25.

The victim, named as Li Xiaoyan, revealed after the footage had surfaced that six people were involved in her brutal attack.

Li Xiaoyan explained: 'They said I called them names but I didn't.' 

She knew four of her attackers, including a 13-year-old who was in the same year as her at school.

On the day of the attack, she had just finished school when her attackers dragged her to the roof of a nearby residential building.

There, she was savagely beaten for three hours.

A video clip showed just a small segment of the attack, during which an unidentified girl slapped Li Xiaoyan 32 times within 99 seconds.

Her attacker also kicked her and pulled her hair during the assault.

Throughout the whole ordeal, her attacker and the girl who filmed the incident were heard swearing at Li Xiaoyan. 

Towards the end of the video, Li Xiaoyan, who did not retaliate, had a nose bleed.

When Li Xiaoyan returned home that evening, her parents were horrified to find her face completely swollen. 

However, she was too scared to tell her parents what had happened as the bullies threatened to kill her if she called the police.

It was only after a neighbour shared the footage of the attack with her parents that she finally opened up.

Li Xiaoyan was taken to the local hospital to receive treatment for her injuries, which were said to be mostly on the surface.

Police are currently investigating the incident although no arrests have been made. 

(dailymail.co.uk)