Campuses Locked Down After High School Riot

Four schools near Fontana High School went on lockdown Friday after a riot broke out at the high school.

Students said the brawl began at lunch after someone pulled a fire alarm, sending hundreds of students into an open quad.

Black and Latino students shouted racial slurs at one another and exchanged blows, students said.

Officers from city and county agencies -- some in protective helmets wielding beanbag shotguns -- helped school police break up the fights over the course of two hours.

Fontana police reported no injuries. Officials were investigating whether the incident was racially motivated.