A dozen inmates have been hurt in a brawl at the California Institution for Men in Chino but officials say none of the injuries is life threatening.

Lt. Mark Hargrove says some Hispanic prisoners attacked white cellmates in their barracks-style dormitory shortly after 9 a.m. Friday. Guards used pepper spray and stopped the fighting within minutes.

Hargrove says 12 inmates were hurt. Most had bruises but five were sent to hospitals, including two with superficial puncture wounds.

The cause of the fight was not immediately known.

All prisoners had been confined to their dorms since Thursday, when a statewide prison lockdown was enacted after some guards were stabbed at the state prison in Tehachapi.

Hargrove says the CIM fight was unrelated to that attack.

Chino is 40 miles east of Los Angeles.