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NEW ORLEANS -- Officials say underwater inspections at the site of BP s Deepwater Horizon rig disaster have failed to identify the source of a persistent sheen on the surface of the Gulf of Mexico.

The Coast Guard said Tuesday that the recent inspections confirmed BP s Macondo well, which blew out in April 2010 and spawned the nation s worst offshore oil spill, remains secure and isn t leaking any oil.

However, investigators collected samples of a white, cloudy substance that appeared to be coming from several areas on the overturned rig on the sea floor. The substance is not believed to be oil.

Remote-operated vehicles were used to inspect the rig, a riser that once connected the rig to the sea floor and a steel container lowered over a leaking drill pipe after the spill.

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