Castaic, Calif. ? A riot at a maximum-security jail Saturday left one inmate dead and more than 100 injured, including 20 hospitalized with serious injuries, authorities said.

About 1,800 to 2,000 inmates were involved in the riot that lasted nearly an hour at the remote North County Correctional Facility, said Deputy Steve Suzuki, a sheriff’s spokesman. About 200 inmates engaged in “serious fighting,” but it appeared that no weapons were used, he said.

A 45-year-old black inmate who was a registered sex offender was killed and the riot was race-related, Suzuki said. Black and Hispanic inmates at the facility were being segregated, Sheriff Lee Baca said.

“The motivation appears to be racial tensions and a carry-over of a feud between black and Hispanic gangs,” Suzuki said.

Twenty-six inmates were treated at the jail for injuries, Suzuki said. The 20 inmates who were hospitalized did not have life-threatening injuries.

No law enforcement personnel were injured, said Inspector Ron Haralson, of the Los Angeles County Fire Department.

Paramedics were stationed outside the facility because tear gas was used to subdue the rioting, Haralson said.

Televised reports showed a long line of ambulances outside the facility. Firefighters laid out plastic sheets to treat the injured.

The North County Correctional Facility, about 40 miles northwest of downtown Los Angeles, is a maximum-security complex composed of five jails that together house about 4,000 inmates.