A four-storey building collapsed on Tuesday in the Dongri area of Mumbai, trapping about 40 people under the debris, according to local news agency ANI.
Several fire teams and personnel from the National Disaster Response Force have been dispatched to the scene.
There's no official information on possible casualties, but according to fire official Ashok Talpade, rescuers have reached the site of the incident and a clearing operation is in progress.
The incident comes amid the annual June-September monsoon season as heavy rain weakens the foundations of buildings, causing poorly constructed structures to collapse.