A nearly three-minute video, posted online May 14, shows a bloodied inmate being chased and beaten by two others swinging padlocks tied to straps.

A unit at an Arizona prison remained on lockdown Sunday after nine inmates were injured in a fight. Authorities said the altercation involving a large number of inmates broke out Saturday ...

Arizona prison officials said Sunday they are investigating ... open at affected complexes" to relieve the effects of high outdoor temperatures. "At any time, the doors may be secured ...

The attack moves from an interior dormitory space to an outdoor area at the Winchester Unit at Arizona State Prison Complex–Tucson. At no point do correctional staff appear on screen.