SAN JOSE, Calif. – Six people were stabbed as multiple fights erupted at Shoreline Amphitheatre in Mountain View, Calif., on Saturday, resulting in an oldies rock concert shutting down early, police reported.

Shortly after the KISS FM Old School Fiesta concert began at 5 p.m., sporadic fights erupted in the lawn area, police said. Shoreline security officers called in Mountain View police to escort disruptive concert-goers out, police spokeswoman Liz Wylie said.

By 6:30 p.m. the amphitheatre security was overwhelmed, she said, and a group of Mountain View police officers entered and broke up fights.

Numerous fights broke out after 9:30 p.m. In one large fight two men were stabbed, and another man was stabbed in a separate fight. Police called for aid, and officers from Sunnyvale, Los Altos, Palo Alto, Stanford, Santa Clara County and the California Highway Patrol responded.

Police cleared out the lawn area, and the lights were turned up. At 10:15, after the headline band War played, the amphitheatre ended the concert early, Wylie said.

Three stabbing victims were treated at the amphitheatre medical station, then transported to local hospitals with injuries that were not life-threatening, Wylie said. A fourth stabbing victim flagged down an ambulance transporting the victims. Two other stabbing victims walked into a hospital later. As of late Sunday, none of the victims was cooperating with police, and no witnesses had come forward, Wylie said.

Police have found no weapons and have not determined a motive for the attacks.

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