Seven inmates were killed and 17 others injured in a riot at a maximum security prison in South Carolina, the southern US state's Department of Corrections said.
The department said the riot erupted yesterday evening at the Lee Correctional Institution in Bishopville, South Carolina and was brought under control at 2.55am local time today.
"The incident at Lee CI resulted in 17 inmates requiring outside medical attention and 7 inmates were killed," the department said on its Twitter account.
Lee Correctional Institution was secured at 2:55 AM following an incident which started at 7:15 PM. The incident involved multiple inmate on inmate altercations in three housing units.— SC Dept. Corrections (@SCDCNews) April 16, 2018
The incident at Lee CI resulted in 17 inmates requiring outside medical attention and 7 inmates were killed.— SC Dept. Corrections (@SCDCNews) April 16, 2018
All prison guards and law enforcement authorities who responded were "safe and accounted for," it said.
The department had initially described the riot as an "ongoing incident," only revealing the scope of the problem hours after its start at 7:15pm yesterday.
"The incident involved multiple inmate-on-inmate altercations in three housing units," the department said.
Lee Correctional Institution, which is reported to have capacity to hold nearly 1,800 inmates, is a maximum security facility built in 1993 to house violent offenders and inmates who exhibit behavioral problems.
Deadly prison riots have been relatively rare in the United States, despite some notable exceptions.
In 1993, nine inmates and a corrections officer were killed in the Southern Ohio Correctional Facility, a maximum security prison in Lucasville, Ohio.
A two-day riot and hostage-taking at the New Mexico State Prison in 1980 left 33 inmates dead and 200 injured, one of the worst in modern US history.
Probably the most famous was the 1971 rebellion at New York's Attica prison.
After a four-day standoff with inmates holding 42 hostages, New York state police moved in to retake the prison on orders of governor Nelson Rockefeller.
By the time it was over 43 people were dead, including ten guards and prison employees and 33 inmates.