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DRAPER, Utah (AP) — Authorities say a Utah State Prison inmate remains hospitalized after being beaten and stabbed at an outdoor prison yard.

Unified police say the 37-year-old man is in serious condition and expected to survive.

His name hasn’t been released.

Police say the man was wounded Saturday and three other inmates suspected of taking part in the attack are being interviewed.

The prison houses 4,500 inmates and is located in Draper, which is 16 miles (26 kilometers) south of Salt Lake City.