Los Angeles County detention centers remained in a lockdown Sunday, as California sheriff's investigators sought to determine what led to a race-related riot at a maximum-security jail that left one inmate dead and more than 100 injured. Investigators were interviewing hundreds of inmates and witnesses to the fighting that erupted Saturday afternoon at the North County Correctional Facility between blacks and Hispanics, said Steve Whitmore, a spokesman for the county's Sheriff's Department, which operates the jail system.

Sheriff's officials identified the slain inmate as Wayne Robert Tiznor, 45. Tiznor, who was black, was jailed after being arrested Jan. 3 for failing to register as a sex offender, sheriff's officials said. The motivation behind the riot appeared to be a feud between black and Hispanic gangs, investigators said Saturday. It was not clear whether Tiznor was singled out, however.

Black and Hispanic inmates at the facility remained segregated Sunday. About 1,800 to 2,000 inmates were involved in the rioting that lasted for 30 minutes to an hour, and about 200 inmates engaged in "serious fighting," Deputy Steve Suzuki, another sheriff's spokesman, said Saturday.

It appeared that no weapons were used, but inmates tossed mattresses and banged heads against bunk beds, officials said.