Campbell County, TN (WOKI) An investigation is underway after six inmates in the Campbell County Jail are believed to have overdosed.

Campbell County Sheriff’s Office officials say six inmates were taken to LaFollette Medical Center around 1:00 a.m. Wednesday after suspected overdoses. They say the inmates have since been treated and are back in custody.

The substance that caused the overdoses is unknown at this time. CCSO says it is investigating the incident and trying to find out who supplied the inmates.

Officials add the jail is also going to be getting a body scanner, within the next 30 days, to help with cavity searches.