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A fire in a pizza oven which forced the evacuation of more than 1200 people and sent thick black smoke through Sydney’s CBD has been extinguished.

Firefighters were called to the 20-storey building, on the corner of Liverpool and Pitt streets, about 1pm after the fire broke out in the building.

The blaze was brought under control shortly after. By 2.30pm all office workers were allowed to return to the building and fire crews had left the scene. There were no injuries.