A residential building near Mumbai, India collapsed Thursday evening, killing at least 47 people and injuring 70 others, authorities told the Associated Press Friday.
The eight-story building was being constructed illegally on forest land in the suburb of Thane, the Associated Press reported.
One witness told BBC News, "The building collapsed like a pack of cards within three to four seconds."
BBC News reported police said the cause of the collapse is not clear, but it appeared to be caused by the use of substandard building material.
The Associated Press reported 17 children were among the dead.
Rescue workers are searching for people who might be trapped inside, police commissioner K.P. Raghuvanshi told the Associated Press Friday.
Builders allowed residents to move in before construction was complete, BBC News reported.
The Associated Press reported the first four floors of the building were completed and had occupants, police said. Three more floors were completed, and workers were adding to the eighth when it collapsed.
Building collapses are common in India, the Associated Press reported, because of illegal building practices and high demand for housing.
Inadequate supervision allows builders to use poor quality supplies and add unauthorized floors, the Associated Press reported.
The Associated Press reported nearly 70 people were killed in a residential building collapse in New Delhi in November, 2010.