MIAMI — Oil is contaminating a section of coastline in the Bahamas, leaving blackened slicks along the coast and in the water days after a Norwegian company reported that Hurricane Dorian had blown the tops off oil storage tanks.

The Norwegian oil company that owns the damaged tanks, Equinor, said it was investigating whether the oil came from them.

The company made the announcement about the possible extent of the oil leak near the bottom of a news release highlighting the company’s $1 million donation to hurricane relief efforts. It had initially said that the leak was contained to land and that only three tanks contained oil.

Cleanup crews began work on Wednesday, a week and a half after Dorian, a Category 5 hurricane, damaged the tanks at the company’s oil storage and shipment terminal on the eastern end of Grand Bahama island, in South Riding Point.