March 10 (Reuters) - The U.S. Coast Guard said an

overflight on Sunday no longer detected an oil sheen off the

coast of Huntington Beach, California, after oil spill

discovered on Friday was cleaned up.

The agency said offshore recovery assets would be

demobilized after they recovered about 85 gallons (322 liters)

of product from the ocean.

"Shoreline cleanup teams continue to observe tar balls along

the beaches in Huntington Beach and will continue to remove them

as needed," the agency said, adding they had already removed

about 800 pounds (363 kg) of oily waste and tar balls.

The agency spotted the oil spill on Friday about 2.8 miles

(4.5 km) off Huntington Beach, near two drilling platforms.

An investigation into the cause of the oil spill is

currently under way, the agency said on Saturday.

Beta Offshore, a subsidiary of Amplify Energy Corp ( AMPY )

reported a potential spill of produced water from its offshore

Platform Elly off Huntington beach on Friday, according to a

regulatory filing, causing the company to shut down a pipeline.

Amplify Energy ( AMPY ) said on Friday in a statement that it had no

indication that the sheen was related to its operations.