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Casey Christie/ The Californian

A correctional officer watches from a guard tower seen through the razor wire near the vehicle sally port that leads into the main prison area of the brand new Kern Valley State Prison in Delano in this 2005 photo.

Ten inmates have been taken to local hospitals with stab wounds following a riot Thursday morning at Kern Valley State Prison in Delano.

Prison spokesman Lt. Jeff Smith said the riot began about 9:51 a.m. in a recreation yard of Facility B and lasted five to 10 minutes. It's unknown what started the riot or how many people were involved, but about 50 to 70 inmates were on each side of the yard when it happened.

Guards used chemical agents and fired sponge rounds to stop the fighting, Smith said. The severity of the injuries was not immediately known.

Investigators with the prison’s Investigative Services Unit are looking into the incident, a prison news release said.

Kern Valley State Prison, which opened in 2005, has 3,782 minimum-, medium-, maximum- and high-security custody inmates. 

The Californian