The Oklahoma Department of Corrections is investigating a fight that injured five inmates Saturday at the Dick Conner Correctional Center in Hominy. The facility is a medium-security prison for men. DOC says the fight took place between rival gang members. Two inmates were transported to a Tulsa hospital via medical helicopter and a third inmate was taken via ambulance to a Tulsa hospital. Two other inmates were treated for their injuries at the prison. The injuries are considered non-life threatening. DOC says it is investigating what led to the fight.