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FILE - In this April 21, 2010 file aerial photo taken in the Gulf of Mexico more than 50 miles southeast of Venice, La., the Deepwater Horizon oil rig is seen burning. Before the key piece of evidence has even been analyzed, oil giant BP PLC on Wednesday, Sept. 8, 2010, planned to release the conclusions of its internal investigation into the rig explosion that killed 11 workers and led to the massive Gulf of Mexico spill. (AP Photo/Gerald Herbert, File) Gerald Herbert/AP