Photo taken on December 5 shows a truck lying on the highway after an explosion. Four people were killed and at least six others were injured after the truck fully-loaded with gunpowder exploded Saturday in central China's Hubei Province. The accident happened at about 00:20 am at a section of the Beijing-Zhuhai Highway in Xiaogan City of Hubei. The truck was heading for northern Hebei Province, carrying five tonnes of gunpowder from a firework material factory in Liuyang City of central China's Hunan Province. [Xinhua]