A propane tank explosion along the Delmarva Central Railroad tracks in Bear, Delaware, damaged several buildings and homes Saturday afternoon, officials said. Video obtained by CBS News Philadelphia shows thick black smoke before a large explosion sends bystanders running for cover. Click the link in our bio for more. | CBS Philadelphia

WARNING: Video contains expletive footage of the propane truck explosion, caught by nearby resident Kelly Scherfig. See details from a previous update below: DEVELOPING: At approximately 2:30 p.m., a propane truck caught on fire at the Kenyon Noble mix plant off U.S. Highway 191 near Big Sky. The fire extended to a nearby building, and the truck exploded, according to law enforcement officials. The highway is closed south of its junction with MT Highway 64, and officials say travelers can expect