Prisons spokesman Jeff Taillon said State Law Enforcement Division agents were required to help secure Lee Correctional Institution at 3am local time on Monday (8am in the UK).
A sequence of fights that raged for more than seven hours at a SC prison left seven inmates dead and 17 more needing "outside medical attention", the S.C. Department of Corrections said early Monday. No details yet on what set off the fight, only that "multiple inmate on inmate altercations" broke out in three housing units about 7:15pm Sunday, per a tweet from the state Department of Corrections.
No officers were wounded, he said.
SC state police have been called to an "ongoing situation" at one of the state's most unsafe prisons.
The South Carolina Department of Corrections says seven inmates have died following an incident at Lee Correctional Institution.
Two officers were stabbed in a 2015 fight.
They say the incident resulted in 17 inmates requiring outside medical attention and seven inmates were killed.