The building collapsed in the Dongri neighborhood on Tuesday afternoon, said Tanaji Kamble, a spokesman for Mumbai’s civic authority.
Local and federal agencies have been mobilized for search and rescue efforts, including Mumbai police and firefighters, and three teams from the National Disaster Response Force. Five people have been rescued so far.
Adjacent buildings are also in dangerous conditions, and residents inside are being evacuated, said Mumbai fire brigade chief Prabhat Rahangale.
The cause of the collapse has not yet been determined. A developer had been appointed and approved to redevelop the 100-year-old building, but it remains unclear whether that contributed to the collapse, said Maharashtra state Chief Minister Devendra Fadnavis.
“Our main focus at the moment is to rescue the people trapped under the debris. After that we’ll focus on investigation,” he added.
In Mumbai, officials have declared the storm to be the worst the city has experienced in over a decade.