Residential building collapses in Mumbai area, killing 62 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 62 people and injuring 70, 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. At the time of the collapse, 100 to 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 were still 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. "All the three floors are sandwiched ... so it's very difficult for us," he said. The dead included 17 children, police said. A nearby hospital was filled with the injured, many of whom had head wounds, fractures and spinal injuries. Hospital officials searched in vain for the parents of an injured 10-month-old girl who had been rescued. At least four floors of the building had been completed and were occupied. Workers had finished three more floors and were adding the eighth when it collapsed, police said. It was not immediately clear what caused the structure to collapse, but officials said it was badly built. Police were searching for the builders. Building collapses are common in India as builders try to cut corners by using poor quality materials, and multistory structures are built with inadequate supervision. The massive demand for housing around India's cities and pervasive corruption allow builders to add unauthorized floors or build entirely illegal buildings. The neighborhood where the building collapsed was part of a belt of more than 2,000 illegal structures that had sprung up in the area in recent years.