A major fire broke out today in a five-storeyed building at Colaba in South Mumbai, officials said. The blaze erupted on one of the top floors in a commercial-cum residential building around 4 PM, said officials of Disaster Control Department of the Brihan Mumbai Corporation.However, no casualties have been reported as occupants were quickly evacuated, they said.<br/><br/>Ten fire tenders have been pressed into service and fire-fighting operations are underway. Personnel from nearby<br/>police stations have also been rushed to the spot.The cause of the fire is not yet known and further details are awaited.