A police spokesperson said an individual had been taken into custody on site shortly after staff received reports of disorder at the courthouse.
They stated there was no risk to the wider public in relation to the incident.
A single fire engine had been parked at the front of the courthouse but firefighters have since left as has an ambulance that was stationed at the back of the courthouse on Hunt St.
St John had dispatched an operations manager, an ambulance and a rapid response vehicle to the scene.
A police car remained at the front of the building with another two located on Hunt St.
The court has now reopened its doors and resumed sittings.
Inside the building this morning, police are present and the lift has been taped off. There is an ‘out of order’ sign on it and a cleaning bucket alongside.