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CUSHING, Okla. (AP) — A spokesman for a company that owns and operates prisons says three inmates are dead and five injured after a disturbance at an Oklahoma prison.

Steve Owen of Nashville, Tennessee-based Corrections Corporation of America says staff at Cimarron Correctional Facility in Cushing quelled an inmate disturbance around 4:40 p.m. Saturday. He says in a release the incident lasted about 40 minutes and was contained to one housing pod.

No staff members were injured. The inmates who were hurt have been taken to hospitals. It’s not clear what caused their injuries.

The names of those killed and injured were not immediately released.

The prison is on lockdown. It houses medium- and maximum-security male inmates for the Oklahoma Department of Corrections.

Cushing is about 50 miles southwest of Tulsa in northeast Oklahoma.

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