The “Beat Summer Jam 2002” concert at the Verizon Wireless Amphitheater started at about noon on Sunday and ended after the brawl erupted about 7:30 p.m., said Lt. Al Muir of the Irvine Police Department. LL Cool J performed at the event and rapper Nelly also was scheduled to appear.

Security officers at the event were overwhelmed by the fighting and called for help, Muir said. Officers from six nearby police agencies and Orange County Sheriff’s deputies responded to the site and by 9 p.m. had evacuated the concert grounds and parking lot, Muir said.

Three people suffered minor injuries and one person was taken to a nearby hospital for treatment, officials said.

No arrests were made as a result of the fight.

The concert had about 30 minutes left when it was canceled, Muir said.