A portion of the under-repair 'Gokul Nivas', an over- century old four-story building in the densely populated Kalba Devi area, collapsed as wooden beams and columns were gutted in the fire that broke out in the afternoon, said senior police inspector S S Mandalik of L T Marg police station.
The building has some residential apartments on the fourth floor and cloth godowns and shops on the floors below.
Chief fire officer Sunil Nesrikar received 40 per cent burn injuries and was admitted to the special burns hospital in Airoli in neighbouring Thane district, said Prabhat Rahangdale, deputy chief fire officer.
Deputy chief fire officer Ameen received 80 to 90 per cent burn injuries. Two other fire officers, S W Rane and M M Desai, were missing, Rahangadle added. It is feared that they could be trapped under the debris.
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A couple of residents too were injured. They were admitted to nearby Masina Hospital.
17 fire engines and 10 tankers were rushed to the spot.
Maharashtra Housing Minister Prakash Mehta visited the spot late in the night.