FILE - An oil-soaked bird struggles against the oil-slicked side of the HOS Iron Horse supply vessel at the site of the Deepwater Horizon oil spill in the Gulf of Mexico, off the coast of Louisiana, in this May 9, 2010 file photo. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP Photo/Gerald Herbert, File)

Associated Press
FILE - An oil-soaked bird struggles against the oil-slicked side of the HOS Iron Horse supply vessel at the site of the Deepwater Horizon oil spill in the Gulf of Mexico, off the coast of Louisiana, in this May 9, 2010 file photo. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP Photo/Gerald Herbert, File)
FILE - An oil-soaked bird struggles against the oil-slicked side of the HOS Iron Horse supply vessel at the site of the Deepwater Horizon oil spill in the Gulf of Mexico, off the coast of Louisiana, in this May 9, 2010 file photo. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP Photo/Gerald Herbert, File)
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