The New Mexico State Penitentiary riot, which took place on February 2 and 3, 1980, at the Penitentiary of New Mexico (PNM) south of Santa Fe, was the most violent prison riot in U.S. history. Inmates took complete control of the prison and twelve officers were taken hostage. Several inmates were killed by other prisoners, with some being tortured and mutilated because they had previously acted as informants for prison authorities. Police regained control of PNM 36 hours after the riots had begun. By then, thirty-three inmates had died and more than two hundred were treated for injuries. None of the twelve officers taken hostage were killed, but seven suffered serious injuries caused by beatings and rapes.