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Thad Aleen says, the only way to permanently plug up the well has to come within 5ft of where the leak was.
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A new cap is in place, which has temporarily shut it off.
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Adm Allen tells BP he is concerned about a " detected steep " on the sea floor near the well and other " undetermined anomalies ."
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Ships included in the BP efforts to secure the blown-out well prepare to resume work after a tropical storm.
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U.S. Scientist say the oil from the well has cleared from the sea surface faster than expected.
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The U.S. Environmental Protection Agency says in a study the dispersant used after the spill is no more toxic than oil alone.
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4.9 million barrels of oil leaked before well capped last month. Scientist say only 1/5 of the leaked oil- 800,000 was captured during clean up
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The U.S. government says three-quarters of the oil spilled into the Gulf of Mexico has been cleaned up or broken up.
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Thad Allen, the U.S. Coastguard official, says the oil well at the center of the leak poses " no further risks" to the environment. They're going to pump concrete into the well.
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BP pumps cement to seal the damage well after it was intercepted by a relief well.