HUNTINGTON BEACH, Calif.—The pipeline that leaked tens of thousands of gallons of oil into the water off Southern California may have been caught by a ship’s anchor and torn as it was apparently dragged along the ocean floor, authorities said Oct. 5. Federal transportation investigators said preliminary reports suggest the failure may have been “caused by an anchor that hooked the pipeline, causing a partial tear.” The break in the line occurred about 5 miles offshore at a depth of about 98 feet (30 meters) beneath the surface, the investigators said, again citing preliminary findings. Those findings were included in a Tuesday order from the Department of Transportation’s Pipeline and Hazardous Materials Safety Administration. The order blocks the company from restarting the pipeline until it carries out extensive inspections and testing to make sure the line is sound. The order did not identify the source of the investigators’ information, and …