A private dive team will try to locate the source of a suspected oil spill spotted in the Bay Marchand area of the Gulf of Mexico on Sunday, after Hurricane Ida wreaked havoc in the region last week, the U.S. Coast Guard said on Saturday.

U.S. National Oceanic and Atmospheric Administration satellite images, first reported by the Associated Press on Wednesday, showed a miles-long brownish-black slick spreading in coastal waters about two miles (3.2 kilometers) off Port Fourchon, Louisiana, an oil and gas hub.

The images appeared to show the slick drifting more than 12 miles (19 kilometers) eastward along the Gulf coast, the AP said.