Prison guards and inmates were among the two dozen people treated for possible drug exposure inside Ohio's Ross Correctional Institution Wednesday.

Around 9 a.m. Wednesday, an inmate showed signs of a possible drug overdose at RCI, said Ohio State Highway Patrol spokesman Lt. Robert Sellers.

As officers and medical responders arrived, a total of 24 individuals were treated through the administration of naloxone, 10TV reports.

Fentanyl is suspected, possibly dispersed into the air by a fan, said Sellers, who emphasized investigators were still trying to determine exactly what happened.