( CNN ) -- Thousands of inmates rioted at the Reeves County Detention Center in Texas on Saturday , the second disturbance at the prison facility in the last two months . As many as 2,080 inmates from two of the center 's three buildings began fighting in the prison yard about 4:30 p.m. CT , said county Sheriff 's Office Dispatcher Anna Granado . Authorities from several law enforcement agencies responded to quell the violence . However , officials had not brought the unrest under control as of 1 a.m. Sunday , according to the sheriff 's office . Officials said they do not know what prompted the riots . Three inmates were hospitalized , including one with a severed finger , the sheriff 's office said . On December 12 , inmates took two workers hostage and set fire to the recreation area at the center in Pecos , located about 430 miles west of Dallas . The inmates , who had made several demands , surrendered later that night . The prison is a 2,400-bed , low-security facility , operated by Geo Group Inc . It houses federal prisoners as well as inmates from other states . CNN 's Janet DiGiacomo contributed to this report .
NEW : Inmate unrest at Texas prison enters second day . NEW : Authorities : Three inmates have been hospitalized ; one has severed finger . Prison was site of another inmate riot in December . TL;DR NEW: A third person is injured when a guard fires his gun into the air.