Tar balls retrieved Monday from Fort Zachary State Park in Key West, Fla., are shown in this Monday, May 17, 2010 photo provided by the U.S. Coast Guard on Tuesday, May 18, 2010. The U.S. Coast Guard reported that 20 tar balls were found off Key West on Monday, but said a lab analysis would have to determine their origin. Tar balls can occur naturally or come from other sources such as ships. (U.S. Coast Guard/AP Photo)
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