Prima facie, the mishap took place in the ground plus one-storey structure at around 6.15 AM due to a fire that broke out inside the house near MHADA colony in Mankhurd, he said.
In the house collapse, 13 persons, including four women and seven children, were injured. They were rushed to a nearby hospital, where two were declared brought dead while one succumbed to injuries during treatment, an official attached to Mumbai civic body's disaster control room said.
Further details were awaited.