Seven inmates were killed and 17 others were injured in an incident at Lee Correctional Institution in Bishopville, South Carolina, authorities said.
South Carolina Department of Corrections did not immediately return a request for comment Monday morning.
Taillon said no officers were wounded after multiple inmate fights broke out at 7:15 p.m. Sunday.
According to the agency, all staff and responding law enforcement officers were "safe and accounted for".
The prison is located in the Town of Bishopville in Lee County, and is a Level 3 facility, meaning it houses some of the most violent offenders in the SC prison system.
State police have been called to one of South Carolina's most unsafe prisons.
Emergency services from several SC counties responded to the "mass casualty incident", Lee County Fire wrote in a tweet.
At least seven inmates are dead following a major incident at a prison in SC.
The facility, which opened in 1993, houses around 1,500 prisoners, including some of the state's most violent criminals, reports the Associated Press.
Last month, inmates in one part of the prison allegedly took an officer hostage and controlled one side of a dormitory, part of a troubled history that has saw one inmate kill another in February and two officers stabbed in 2015.
This is a developing story, check back for more details.
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