"Authorities were using skimmers and remote vehicles to respond to an oil leak off the coast of Plaquemines Parish on Monday, with more than a million gallons having potentially been spilled, the Coast Guard said.
The total volume of spilled crude was unclear, but the Coast Guard said initial engineering calculations determined the potential amount at 1.1 million gallons. A slick of three to four miles wide was spotted on Thursday, when the spill was first reported, NOAA says.
The leak is near the Main Pass Oil Gathering company's pipeline system. MPOG is owned by Houston-based Third Coast, which did not immediately respond to a request for comment. The site is located about 19 miles offshore, south of the Chandeleur Islands and to the east of the Mississippi River.
Three skimming vessels were working to recover oil from the surface, the Coast Guard said. Remotely operated vehicles were searching for the spot of the pipeline leak, but were so far unsuccessful."