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A major natural gas pipeline explosion in northern Los Angeles County on Saturday prompted authorities to issue shelter-in-place orders and temporarily shut down a key Southern California highway, officials said.The incident occurred around 4.20 pm local time near Ridge Route Road and Pine Crest Place in Castaic, close to the southbound lanes of Interstate 5, a critical route linking Southern and Northern California. The damaged pipeline is a 34-inch transmission gas line, located just east of the freeway.Los Angeles County Fire Department spokesperson Capt. Brian Kight said emergency crews received multiple calls reporting the gas leak. While residents described loud noises, Kight stressed that “there were no reports of any explosions from the leak and no reported injuries,” the Los Angeles Times reported.Videos shared on social media showed orange plumes rising from a hillside, which appeared to have partially collapsed, with debris clouds filling the sky. Several residents said they heard loud booms, while NBC 7 San Diego reported that people across the Santa Clarita Valley felt their homes shake. One witness described a “strong sulfur smell and a loud noise resembling a jet engine,” the outlet added.At L.A. County Fire Department Station 149, located about a mile away, Kight said he could smell gas from “20 minutes out.” The Los Angeles City Fire Department also received reports of a strong rotten egg smell from residents as far away as the north San Fernando Valley.In response, the California Highway Patrol (CHP) closed all lanes of Interstate 5 at 5.12 pm, diverting northbound traffic to State Route 126 and southbound vehicles to State Route 138. Traffic came to a near standstill for miles, leaving motorists stranded for hours, the Los Angeles Times reported. A shelter-in-place order was issued at 5.40 pm that covered much of Castaic. Authorities advised residents to close doors and windows, shut off vents, and turn off HVAC systems.By 6 pm, the gas company had shut off both sides of the ruptured line, though firefighters and a hazardous materials task force continued monitoring a residual leak. The CHP announced shortly before 9 pm that Interstate 5 had reopened.The cause of the rupture remains under investigation. While officials said it is unclear what triggered the incident, Los Angeles County Sheriff’s Department deputies told CBS Los Angeles that it was possibly caused by “a mudslide.”More details awaited.
