Visitations have been canceled at the Coyote Ridge Corrections Center in Connell after a Saturday fight among multiple inmates in the recreation yard of the medium-security facility.
Movement of inmates also is being restricted while the incident is investigated.
Staff immediately intervened to break up the fight. No staff members were injured.
One inmate was treated off-site for a head injury and has returned to the facility. Three other inmates were treated on-site for superficial lacerations.