Inmates armed with homemade knives fought each other for more than seven hours inside a maximum-security prison, leaving seven of them dead, officials said. An inmate who witnessed the riot told The Associated Press that bodies were “literally stacked on top of each other.”

At least 17 prisoners were seriously injured as inmates fought uninterrupted before authorities regained control of Lee Correctional Institution about 3 a.m. Monday, South Carolina prisons spokesman Jeff Taillon said.