Four people have been confirmed dead after a building was destroyed by an explosion at a mining company office building in north China's Shanxi Province, Xinhua quoted the local production safety watchdog as saying today. The explosion occurred at 4:30 p.m. Friday in the office building of the Dongfang Zhenxing Coal Mining Co. Ltd. A deputy director of the company was among the dead. An initial police investigation has ruled out arson. Police said the blast was caused by explosives stored in the mining company.