Workers at a building site at Sydney's Circular Quay have been evacuated after a fire took hold this morning with flames leaping in the air and thick black smoke filling the sky.
Crews responded to the fire about 8:45am after protective mesh surrounding scaffolding on the building caught alight.
It is not yet known how the fire started, but there were reports of a small explosion on the ground level.
There are large amounts of smoke in the area likely due to the material on the scaffolding.
The work site supervisor has reported all workers have been evacuated.
Fire and Rescue New South Wales said there were no reports of injuries.
About 10 fire crews attended the fire and attacked it from the outside before heading inside to see if the flames spread internally.
Sydney Trains said trains were not stopping at Circular Quay station, and roads in the area are closed with significant traffic delays expected.