Doorbell camera video captured a massive explosion in Hayward, California that left at least six people injured and reduced three properties to rubble on Thursday (December 11). Various media outlets, citing the Pacific Gas and Electric Company, reported that the explosion was caused by a damaged underground gas line. Fire department officials said they were dispatched to the site of the explosion at 9:38 a.m. PST (1738GMT). Aerial images showed smoke rising from the site. Firefighters were seen