The warehouse of a building materials market caught fire early Wednesday morning in south China's Guangxi Zhuang autonomous region, leaving three dead, police said. The accident occurred the building materials market at Xiu'an Road in Xixiangtang district in the region's capital city of Nanning, China's News Agency (Xinhua)reported. Three workers were pulled out of the fire and later died in hospital, the police officer said. The fire, which spread over an area of 500 square meters, was put out and the cause of the accident is being investigated, he said.