The Meridian-Lauderdale County chapter of the NAACP made its complaint public Monday at a news conference.
President Walter Patton said a 17-year-old inmate was tied to a pole
while dressed in boxer shorts, left there for 30 to 45 minutes and taunted.
Patton said the NAACP wants jail administrator Kim Reece fired.
"I know this is not the Boy Scouts, but this is not Iraq and this is not a war zone," Patton said. "There's no reason for anybody to be treated this way."
The inmate's name was not released but he was being held on a charge of attempted murder.
Lauderdale County Sheriff Billy Sollie said due to pending litigation he and his staff must refrain from commenting.
"We've done our own internal investigation," said Sheriff Sollie. "Our law firm has done their investigation and we're going to move forward."