Two die in Mumbai building collapse
The building had already been condemned as unsafe when it crashed down into a huge pile of concrete slabs, rubble and dust, Disaster Response Force commander Alok Awasthi said.
Rescuers pulled out two bodies as well as three survivors with minor injuries, Mr Awasthi said.
Dozens of firefighters and emergency workers are digging into the wreckage in the hope of finding more survivors. Two ambulances are standing by ready to ferry the injured to hospital.
While the building was officially uninhabited, some families were living there illegally. Another dozen or so people had set up makeshift slum huts at the base of the building, in the Santacruz suburb of India's west-coast financial capital.
"Our rough estimate is that there are around eight to 10 people feared trapped inside. Rescue operations are going on," Mr Awasthi added.