March 9 (Reuters) - The U.S. Coast Guard said on

Saturday it did not observe any remaining recoverable oil sheen

during a morning overflight off the coast of Huntington beach,

California.

On Friday, the agency said it was trying to identify the

source of an oil spill off the coast after the sheen, estimated

at 2.5 miles (4 km) in length and 0.5 miles (800 meters) in

width, was discovered when a Coast Guard helicopter flew over

the site at sunrise.

"Tar balls were observed along the shoreline in Huntington

Beach, and onshore recovery teams will assess the shoreline and

remove them as needed," according to the Coast Guard's

statement.

The investigation into the cause of the sheen is currently

underway, the agency said.

The Coast Guard said on Saturday they do not believe the

sheen and a potential spill of produced water from an offshore

platform off Huntington beach on Friday were related.

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

reported the incident at Platform Elly off Huntington beach on

Friday, according to a regulatory filing.

"At this time, we have no indication that this sheen is

related to our operations", Amplify Energy ( AMPY ) said in a statement

on Friday.

In 2021, a spill occurred off the coast of Huntington Beach

when an underwater pipeline running from the Elly platform to

Long Beach leaked about 588 barrels (24,696 gallons) of oil.