At least 14 people were killed in an explosion after a bus and a tractor collided in east China's Zhejiang Province Saturday afternoon, Xinhua quoted local police as saying. The collision happened at about 1:54 p.m. in Yongzhong town, Longwan District of Wenzhou City, Zhejiang. The bus blew up and 13people died at the scene, and another in hospital, said local police. Police are investigating the cause of the accident.