LOS ANGELES (AP) - Authorities say a South Los Angeles high school was locked down and then dismissed early after hundreds of students scuffled during a lunchtime brawl that left many with minor injuries.

School district spokeswoman Nadia Gonzalez says about 600 students were involved in what appeared to be a gang-related fight that started around noon Friday at Locke High School.

Campus officers broke it up and four students were arrested.

Officials said several students were injured but nobody was hospitalized.

The cause of the brawl wasn't immediately known.

Gonzalez said the school was locked down after the battle. Students were kept in their classrooms and no parents or outsiders were allowed on campus. About 50 Los Angeles police officers, some of them in riot gear, responded to the school.