Core Viewpoint - The investigation report on the "3·13" gas explosion incident during the construction of the Yanjiao subway project highlights that the direct cause was damage to a nearby natural gas pipeline during shield tunneling operations, leading to gas leakage and subsequent explosion in a confined space [1] Group 1: Incident Details - The report identifies that the main issues included superficial pipeline investigation and verification by the parties involved in the subway construction, inadequate safety management during gas-related construction, violations of construction regulations by companies, lack of effective local safety supervision, and insufficient underground gas pipeline surveys [1] Group 2: Accountability and Penalties - Seven responsible personnel, including the deputy chief engineer of the involved subway project, have been subjected to criminal coercive measures [3] - Six companies, including China Communications Tunnel Engineering Company and Beijing Urban Investigation Company, are held accountable for the incident and will face penalties as determined by the Langfang Emergency Management Bureau [3] - Beijing Xunlian Company was fined between one to two times the contract amount for violating construction management regulations, with any illegal gains to be confiscated [3] Group 3: Further Actions - A total of 46 individuals from various companies, including China Communications Tunnel Bureau and Beijing Urban Investigation Company, will be referred to relevant disciplinary inspection and supervisory bodies for handling according to regulations [4] - 23 public officials from Langfang City Government, Sanhe City Government, and Yanjiao High-tech Zone Party Committee will receive disciplinary and administrative penalties [4]