Six inmates were injured -- two seriously -- during a prison riot Friday night at a San Diego prison, officials said.

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The disturbance began at the Richard J. Donovan Correctional Facility shortly after 8 p.m., The San Diego Union-Tribune reported.

Cal Fire San Diego spokesman Capt. Thomas Shoots said approximately 100 prisoners were in the prison yard when the riot broke out, the newspaper reported. It was not clear how many inmates were involved in the riot, the Union-Tribune reported.

Officials with the California Department of Corrections and Rehabilitation said a fight involving several inmates on the recreation yard escalated into a riot, KNSD reported. According to KSWB, staff members ordered the inmates to stop fighting. When the fighting continued, "officers used several rounds of less than lethal use of force to quell the disturbance."

Two of the inmates were seriously injured and airlifted to area hospitals, Shoots told the Union-Tribune.

No prison staff members were injured, KNSD reported.

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