A massive prison riot at the High Desert State Prison in Susanville sent at least four inmates to local hospitals with stab wounds Saturday.
The California Department of Corrections and Rehabilitation says about 75 prisoners, predominantly black and hispanic, were involved in the clash.
Two inmates were sent to Reno hospitals, two others where sent to hospitals in California.
DOCR officials told Kolo-8 none of the injuries are thought to be life-threatening.
The maximum security prison will conduct an internal investigation to figure out what started the riot and whether or not it was gang-related.
Officials also stated that prisoners can be highly dangerous and clashes between prison gangs are not uncommon.