The Independent Commission of Investigations, Indecom, is probing the circumstances surrounding an incident, which left two inmates and a police constable suffering from gunshot wounds, on Saturday.
The wounds resulted from the discharge of a firearm at the Freeport Police Station in Montego-Bay, St James.
Commissioner of Indecom, Hugh Faulkner, says the commission is carrying out investigations to determine what unfolded at the police station.
This is the second incident being investigated by Indecom at a police station in recent days.
On Friday, there was an altercation between police and inmates at the Mandeville police lock-up in Manchester.
Indecom said that incident developed following the seizure of a cellular phone.
Commissioner Faulkner said some inmates had to be taken to hospital, for medical treatment.