A major fire broke out in a three-storey commercial building in Marol area of suburban Andheri on Thursday, a civic official said.
So far, there was no report of any casualty or anyone trapped in the premises, he said.
The fire broke out in the ground-plus-three storey building located in Rolta Technology Park around 11.30 am, the official said.
Dense smoke engulfed the building and its staircases, posing difficulties in the fire-fighting operations.
"It is a 'level-3' (major) fire. Twelve fire engines are engaged in dousing the flames. All efforts are being made to extinguish the blaze," the official said.
The fire is confined to the server room on the building's second floor, he said, adding that its cause is yet to be ascertained.