The Brisbane Correctional Centre has been locked down after two inmates began protesting on its roof.
It is understood the men at the correctional centre at Wacol, west of Brisbane, are protesting the detention of a third prisoner at the centre.
Aerial pictures show the men holding poles and one of them tampering with a security camera.
Negotiators have been called in to talk them down.
Queensland Corrective Services says the security of the jail has not been compromised.