A natural gas transmission line ruptured in Castaic, California, on Saturday evening, causing a loud explosion and a strong gas odor that spread to surrounding communities. The incident forced the closure of all lanes on the 5 Freeway and prompted a shelter-in-place order for nearby residents. Authorities reported no injuries and stated there was no immediate threat to the city of Los Angeles. The cause of the rupture is currently unknown, and utility crews are working to secure the line.