A second rig unrelated to the Deepwater Horizon spill has been leaking oil into the Gulf of Mexico since late April, according to reports that appear to show a clearly visible slick at the second location.

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The slick from the Ocean Saratoga rig appears to be several miles long off the coast of Louisiana, according to satellite images visible from space and posted on the website of Skytruth.org, a group that monitors environmental issues. The company that operates the rig has been working to plug the leak, which Skytruth reported on May 15, according to local news reports.

Federal officials asked about the second leak in a morning briefing could not verify its existence, or provide details. But more information could be forthcoming shortly.

“We’re going to get detailed information and make a statement later this afternoon,” said Admiral Thad Allen, the Coast Guard official who is the federal government’s point person on the Gulf oil spill.

The second leak appears to be much smaller than the Deepwater spill. But it may have been going on for much longer, according to reports.

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