The smoke was noticed on the fourth floor of the six storey building at around 4.40 PM, the fire brigade officials department said.
The officials said four fire engines and three water tankers were rushed to over the 100-year-old building that houses the main Mumbai branch of Bank of India and pressed into service to douse the blaze.
As per a bank official, at the time of the incident, there were around 300 people inside the building, who were safely evacuated.
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