NEW ORLEANS Waves from Hurricane Isaac uncovered oil previously buried along Gulf Coast beaches, exposing crude that wasn't cleaned up after the BP spill in 2010.

Since Isaac made landfall more than a week ago, the water the storm has receded and tar balls and oil have been reported on shores in Alabama and Louisiana, where officials closed a 13-mile stretch of beach Tuesday.

BP said Wednesday some of that oil was from the spill, but said some of the crude may be from other sources, too.

"If there's something good about this storm it made it visible where we can clean it up," BP spokesman Ray Melick said.

BP still has hundreds of cleanup workers on the Gulf Coast after the Deepwater Horizon drilling rig exploded, killing 11 workers and leading to the nation's largest offshore spill.

Melick said the company was working with the Coast Guard, state officials and land managers to clean up the oil on the Fourchon beach in Louisiana. He said crews would be there Thursday.

Isaac made landfall near Fourchon on Aug. 28 as a Category 1 storm, pummeling the coast with waves, wind and rain. Seven people were killed in Louisiana and Mississippi.

Ed Overton, a chemist and oil spill expert at Louisiana State University, said the exposed oil was weathered and less toxic, though it could still harm animals such as crabs, crawfish and bait fish.

He said the storm helped speed up natural processes that break down oil and it might take several more storms to stir up the rest of the oil buried along the coast.

"We don't like to say it, but hurricanes are Mother Nature's way of taking a bath," he said.

See more here:

Oil from BP spill turns up on Gulf beaches after Hurricane Isaac; company to clean it up