A Blackhawk helicopter prepares to drop sandbags in their efforts to dam off part of the marsh on Elmer's Island in Grand Isle, La., Monday, May 10, 2010. Oil giant BP PLC's oil rig exploded April 20, in the Gulf of Mexico killing 11 workers. It sank two days later, and oil is still pouring into the gulf. (AP Photo/Alex Brandon)
A Blackhawk helicopter prepares to drop sandbags in their efforts to dam off part of the marsh on Elmer's Island in Grand Isle, La., Monday, May 10, 2010. Oil giant BP PLC's oil rig exploded April 20, in the Gulf of Mexico killing 11 workers. It sank two days later, and oil is still pouring into the gulf. (AP Photo/Alex Brandon) Associated Press
A Blackhawk helicopter prepares to drop sandbags in their efforts to dam off part of the marsh on Elmer's Island in Grand Isle, La., Monday, May 10, 2010. Oil giant BP PLC's oil rig exploded April 20, in the Gulf of Mexico killing 11 workers. It sank two days later, and oil is still pouring into the gulf. (AP Photo/Alex Brandon) Associated Press

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Texas braces for 'tar ball event' from gulf oil spill

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