According to initial reports, the building located on Thane-Mahape road named Lucky Compound collapsed when the construction work in the seventh floor was underway.
It was feared that the labourers working in the building might have got trapped under the debris. Two fire engines were sent to the spot to rescue the injured. The administration also pressed into four cranes to clear the debris. Local people also joined the rescue work with the officials.
A team of the National Disaster Response Force and hundreds of policemen from Mumbai were sent to the spot.
It has been alleged that the building was illegal and did not have any proper certification.
Deputy Collector Manoj Gohad said the bodies had been extricated. Officials said at least 80 people were present in the building when it crumbled.
Municipal Commissioner R A Rajeev and District Collector P Velarasu supervised the relief operation.
The state assembly, which is in session currently, had stressed the issue of illegal constructions on the road belt where the latest accident took place. The authorities were yet to take action against the culprits.
(With agency inputs)