California officials say an inmate is suspected of attacking and severely injuring a correctional officer at a prison north of Los Angeles.
The Department of Corrections and Rehabilitation says the inmate rushed a control booth during an afternoon shift change Monday at the state prison in Lancaster.
Authorities say the 32-year-old inmate punched the officer in the face, knocked him to the ground and then stomped on his face.
An alarm was activated and guards fired a non-lethal round at the attacking inmate and subdued him.
The officer suffered a fractured bone in his face. He's expected to survive.
The inmate was treated for bruises and transferred to a segregation unit at the state prison in Corcoran. Officials say he's serving a life sentence with the possibility of parole for rape.