this specific residential area is an old residential area located in Xiaozhanggezhuang Village, Yanjiao, sanhe city, Langfang City, Hebei Province, and an explosion occurred in a restaurant in the bottom business.

it is preliminarily judged that the explosion accident in Yanjiao was caused by gas pipeline leakage. Further information shows that the explosion may be related to the improper operation of subway construction, resulting in gas leakage and a violent explosion when it meets an ignition source under certain conditions.

this accident caused serious casualties and property losses, and aroused great concern of the society about gas safety.