Oil sheen mysteriously appears off Louisiana's Gulf Coast - KYTX CBS 19 Tyler Longview News Weather Sports

Oil sheen mysteriously appears off Louisiana's Gulf Coast

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(CNN) -- An oil sheen about four miles long has appeared in the Gulf of Mexico near the site of the worst oil spill in U.S. history, a Coast Guard spokesman said Thursday.

It was not immediately clear where the oil is coming from, said Petty Officer 3rd Class Ryan Tippets.

The Coast Guard found out about the oil sheen on September 16 after someone spotted it on a satellite image from the multinational oil and gas company BP, Tippets said. A Coast Guard response team went to the location to collect samples, and sent them to the Coast Guard Marine Safety Lab in Connecticut for testing. Test results are expected in a few weeks, Tippets said.

The service's Marine Safety Unit Morgan City, in Louisiana, is heading up the investigation of the spill, which is in the part of the Gulf officially designated MC252. No one has reported any adverse effects on the environment or marine life, Tippets said.

The sheen is near the spot where, on April 20, 2010, BP's Deepwater Horizon drilling rig exploded over the Macondo well, killing 11 workers and spewing oil that spread across a huge portion of the Gulf.

The badly damaged mile-deep well leaked oil into the Gulf of Mexico for five months. On September 19, 2010, retired Coast Guard Adm. Thad Allen, who led the federal disaster response, declared that a cement plug had permanently sealed the leak, so that it posed no further threat.

In total, about 4.9 million barrels (205.8 million gallons) of oil leaked into the Gulf, according to estimates from federal scientists.

In an incident that appears unrelated to the new oil sheen, the Coast Guard's Morgan City unit also is investigating a small amount of oil leaked from a Gulf oil platform.

Apache Corp. reported the spill to the Coast Guard and regulators as soon as the company noticed the leak on Tuesday, said Apache spokesman John Roper.

He said a valve problem caused less than two barrels (84 gallons) of oil to spill into the water near Grand Isle, Louisiana.

No marine or environmental damage has been reported from this incident either, Tippets said.

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