The Associated Press reports officials are still unable to identify the source of a persistent oil sheen on the Gulf of Mexico.  Tuesday's report confirms the Macondo well is not the source of the oil, and it's not leaking. The well blew out on the night of April 20th, 2010, causing the worst offshore oil spill in US history, and killing 11 workers.

A white, cloudy substance appears to be coming from the wreckage of the Deepwater Horizon drilling rig that was destroyed by the well blowout. samples have been collected, and the substance is not believed to be oil.

The inspections of the well, and nearby debris were executed by remote-operated vehicles.

Gulf Oil Spill
Mario Tama, Getty Images
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