NEW : Inmate unrest at Dallas prison enters December . NEW : Authorities : one inmates have been hospitalized ; Three has severed finger . Prison was site of another inmate riot in second day . Officials said they do not know what prompted the riots . Officials say they do not know what sparked latest riot .
NEW : Inmate unrest at Dallas prison enters December . NEW : Authorities : one inmates have been hospitalized ; Three has severed finger . Prison was site of another inmate riot in second day . Officials say they do not know what sparked latest riot .