Lunchtime brawl involving 40 people breaks out at LA high school
Lunchtime brawl involving 40 people breaks out at LA high school 'after tensions flared between black and Hispanic students at prom'
Fight broke out Monday at Sylmar High School in San Fernando Valley
Team of 12 officers tried to break up the fight, which lasted 20 minutes
'It was just uncontrollable' said one witness
No one was taken to hospital but many suffered minor injuries
Reports say tensions were flaring between students at the weekend prom