SCHOOLGIRLS as young as 14 are squaring off in vicious prearranged brawls throughout Sydney and posting footage of their bloody exploits on the internet.

In sickening scenes of unchecked violence, the teenagers are cheered on by throngs of baying teen males as they attack each other in brutal one-on-one punch-ups in parks and train stations .

The premeditated fights, between a core group of 30 girls from schools in southwestern Sydney, are recorded from multiple angles on mobile phones and later edited and uploaded to YouTube.

In two such videos uncovered by The Sunday Telegraph, the teen combatants eventually have to be forcibly separated after a ruthless barrage of punches, kicks and hair pulling.

The most disturbing clash is called off only after one girl's nose is broken when she is kicked in the face after falling to the ground, in what is ruled "a dog shot" by onlookers.

Most of the participants attended Penshurst Girls, Kogarah, Kingsgrove and Kingsgrove North high schools and are seeking entry to a street gang called See F*cking Hurstville, but former students and other schools are also involved.

High school dropout Meagan Ross, 16, whose nose was broken in the gruesome clip, said she had to be hospitalised after her fight with fellow gang member Tiamera Nelio, 15, but was proud to display the footage online - and claimed she had even received praise from local police officers.

She claimed police knew about the fights but did nothing to stop them.

"I've had cops come up to me and say they saw the video on YouTube," she claimed.

"They don't care if we fight. I think they're used to it."

In a twisted sense of loyalty, Ms Ross said she now counted the girl who broke her nose as one her closest allies.

Ms Nelio, a student at Sir Joseph Banks High School in Revesby, said she lost part of a tooth in the brawl and had to be treated at a medical centre for injuries to her mouth caused by a lip stud.

"But now people know they shouldn't mess with me," she said. "It's good that we have YouTube to get our message out there."

Far from condoning the brutality, NSW Acting Deputy Police Commissioner Carlene York said police would come down hard on any teens who were involved in fights.

"Those involved in this kind of behaviour may find themselves subject to formal police action for the offences of assault, affray or violent behaviour," she said.

NSW Minister for Women Pru Goward said she found the footage disturbing and the government needed to explore the reasons behind the antisocial behaviour.

Both clips were last week removed from YouTube following inquiries by The Sunday Telegraph. The Education Department said it would investigate the fight clubs and take swift action against any student found to be involved.

"Violence is not tolerated in NSW public schools because it is a criminal offence and can result in serious injury," a department spokesman said.

"Schools are required to report such incidents to the police and parents, with automatic suspension imposed on aggressors."

YouTube spokesman Henning Dorstewitz said administrators did not check videos before they were uploaded and had no idea how many violent clips were on the site.

He said they relied on viewers to make a complaint if content was inappropriate and then those videos will be reviewed and removed.

"We need to be informed where these videos are on the site," he said.