There was so far no report of any casualty, the BMC said, adding some residents were stranded in the building and the rescue operation was underway

Mumbai and its suburbs have been receiving heavy rains since Saturday

A portion of the building located in Chittaranjan Nagar of Rajawadi Colony in suburban Ghatkopar collapsed at 9.33 am, the BMC said

Fire brigade, police and civic personnel rushed to the spot

Earlier, heavy rains in several parts of Mumbai on Saturday to the death of two persons who were washed away in a drain. The heavy showers had also caused traffic snarls, tree fall incidents and short circuits, as per officials