OKLAHOMA CITY (AP) - Authorities are investigating fights at three Oklahoma prisons since Saturday that left nine inmates hospitalized with stab wounds and each prison on lockdown.
Department of Corrections spokesman Jerry Massie says no staff members were injured and all the inmates are expected to survive.
Fights at two prisons broke out on Monday.
Four inmates were stabbed in two separate fights at the Dick Conner Correctional Center. The first was about 1 p.m. inside a housing unit and one inmate was sent to the hospital.
Then three other inmates were stabbed shortly before 6 p.m. during a fight in a different housing unit.
Also Monday four inmates were stabbed at the Oklahoma State Reformatory in Granite after a fight broke out about 3 p.m. in a prison yard. Nine other injured inmates were treated at the facility.
And one inmate was stabbed Saturday at the Mack Alford Correctional Center in Stringtown.