At least 16 people died and 43 were injured Sunday in a factory explosion in eastern China's Anhui province, a police source and state media said. The explosion occurred at 03:17 am (1317 PST) in the workshops of a privately owned factory that produces and processes quartz sand in the district of Fengyang, the official Xinhua news agency reported, citing local authorities. "At the moment we have 16 dead confirmed," a local policeman, who declined to give his name, told a foreign news agency. "It happened in a mining area. We don't know what caused the blast."