The "mass casualty incident" at the Lee Correctional Institution in Bishopville, South Carolina, erupted around 7:15 p.m. and didn't end until 2:55 this morning, the South Carolina Department of Corrections said in a statement.
The deadly altercation occurred in three housing units at the maximum security prison.
"All SCDC staff and responding law enforcement officers are safe and accounted for," according to the statement.
"All SCDC staff and responding law enforcement officers are safe and accounted for," according to the statement.