Thane, India, collapse of seven-story building kills at least 35 THANE, India, April 5 (UPI) -- The use of substandard construction materials was the most likely cause of a building collapse that killed at least 35 people in Thane, India, authorities said. At least 60 people were injured and more victims were feared trapped in the rubble after the seven-story building toppled about 6:30 p.m. Children were among the victims, authorities said. Rescuer Sayed Sadiq said people were living on the first five floors of the building and construction was under way on the sixth and seventh floors. Thane legislator Ramesh Patil said the construction of the building was unauthorized and it was unfit for occupation. Police inspector Digamber Jangale told the BBC the use of substandard building materials was likely the cause of the collapse. Daighar village police said they were attempting to locate builders Salil and Khalil Jamadar and intend to charge them with culpable homicide not amounting to murder, the Press Trust of India reported.