MUMBAI, India — A residential building being constructed illegally on forest land in a suburb of India’s financial capital collapsed into a mound of steel and concrete, killing at least 47 people and injuring 70 others, authorities said Friday.
The eight-story building in the Mumbai suburb of Thane caved in Thursday evening, police said. Rescue workers with sledgehammers, gasoline-powered saws, and hydraulic jacks struggled Friday to break through the tower of rubble in their search for possible survivors. Six bulldozers were brought to the scene.
‘‘There may be [a] possibility people have been trapped inside right now,’’ police commissioner K.P. Raghuvanshi said Friday.
At the time of the collapse, between 100 and 150 people were in the building. Many were residents or construction workers, who were living at the site as they worked on it, said Sandeep Malvi, a spokesman for the Thane government.
More than 20 people remained missing Friday afternoon and three floors of the building remained to be searched, said R.S. Rajesh, an official with the National Disaster Response Force who was at the scene.