Officials in Mumbai say at least 70 people died when a multi-storey building collapsed on Thursday evening, at least 17 of them children.
One man lost 13 members of his family, including his pregnant wife.
More than 100 people were inside the building in Mumbra on the outskirts of the city when it collapsed.
A BBC correspondent in India said construction of the building began six weeks ago. Seven floors were built and in that time and the eighth floor was under construction.
Even though the construction was incomplete, the builders had allowed families to move in.
It is not yet clear what caused the collapse, but Inspector Digamber Jangale told the BBC it appeared to be due to the use of substandard building material.
In other recent incidents:
At least 13 people died when part of a half-constructed building collapsed in the Wagholi area of Maharashtra in December
At least six people were killed when a building collapsed in Pune city in Maharashtra in September
Nearly 70 people died when a residential building in the capital Delhi caved in November 2010.