A huge explosion outside a chemical plant in China's northern Hebei province on Wednesday killed at least 22 people and left as many others injured, the second major industrial accident in the country in the last four days.

The blast occurred outside the Hebei Shenghua Chemical Industry in Zhangjiakou, Qiaodong district around 12:40 am, igniting a fire that engulfed nearby vehicles, the officials were quoted as saying by thepaper.cn, a Shanghai-based website. An industrial safety official, identified only as Wu, said that one of the trucks lined up outside the plant to deliver chemicals had exploded, setting off a chain reaction that engulfed other trucks.