A natural gas line ruptured north of Los Angeles on the afternoon of Saturday Dec. 27, shutting down portions of Interstate 5, a heavily trafficked north-south route.   The California Highway Patrol began reopening the freeway around 9:30 p.m. Local media outlets reported that officials lifted a shelter-in-place order that was in effect in parts of northern Los Angeles County near Castaic, California. The California Department of Transportation’s local district said the hazmat incident fully closed Interstate 5 between S.R. 138 and S.R. 126. “AVOID THE AREA, seek alternate routes,” Caltrans said in an X post at 6:40 p.m. local time. The cause of the leak wasn’t immediately known. Gov. Gavin Newsom's office said he had been briefed on the commercial pipeline rupture and state emergency services officials were responding to the scene. The smell from the natural gas leak reached miles away in the San Fernando Valley, within Los Angeles city limits, according to a city fire department alert.