A mass brawl involving about 40 people broke out on the campus of a Los Angeles high school on Monday, in a fight that officials believe was started at prom over the weekend.

A team of 12 officers and a supervisor dispatched by LA Unified School Police tried to break up the brawl as it happened at Sylmar High School in San Fernandino Valley at lunchtime.

According to reports, the fight lasted for 20 minutes, with numerous videos taken at the scene since uploaded to YouTube.

Major brawl: A team of 12 officers and a supervisor dispatched by LA Unified School Police tried to break up the brawl as it happened at Sylmar High School in San Fernandino Valley at lunchtime on Monday

An officer can be seen here in his video trying to restrain a student was kicking another on the ground

According to reports, the fight lasted for 20 minutes, with numerous videos taken at the scene since uploaded to YouTube

A mass brawl involving about 40 people broke out on the campus of Sylmar high school on Monday, in a fight that officials believe was started at prom over the weekend

Scene: Footage posted to YouTube showed a number of teens involved in a physical altercation

Witnesses said everyone walked away and that no one was taken to hospital, but several students were bloodied and bruised with black eyes.

KTLA 5 News reported that the reason behind the brawl was race and gang-related.

It is said that tensions flared between some black and Hispanic students at the prom at the weekend, and that school officials were worried the problem would come to a head Monday.

The videos show punches and kicks being through around, as other students fled for cover.

Officers can be seen jumping in to break up the fights, as others begin happening around them.

'It was just uncontrollable,' said one student,

'It was just uncontrollable': Student Juan Ayala (left) and another junior (right) give interviews after the fight

The principal sent out a letter to parents Monday to inform them of the fight and that students involved are receiving disciplinary actions. But there were no known arrests.

James Lee, the school's principal, said in a statement to parents that 'multiple students participated in a conflict during lunch on campus'.

According to Lee, 'disciplinary actions have been taken' and the parents of the students have been contacted.