At least 10 inmates at a state prison in Central California have been taken to hospitals for treatment of stab wounds after several fights broke out at the prison's maximum-security yard.

State corrections officials say groups of inmates at Kern Valley State Prison in Delano began fighting a little before 10 a.m. Thursday.

Officers were able to quickly stop the fights using pepper spray, chemical agents and direct impact rounds.

Officials say staff members were still assessing inmates involved in the fights for injuries in the afternoon.

The prison opened in 2005 and houses more than 3,700 inmates.