TULSA, Okla. (AP) — Hundreds of inmates — some armed with baseball bats and iron pipes — rioted at an Oklahoma federal prison for about eight hours, taking two guards hostage and refusing to return to their cells before they were finally corralled by law enforcement officers, authorities said Monday.

The riot started late Sunday at the Great Plains Correctional Facility in Hinton after a fight broke out in the prison yard, and rapidly escalated from there, said Caddo County Sheriff Lennis Miller. Miller said the inmates refused to return to their cells and at one point occupied one building in...