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An explosion causes an oil spill in the Gulf of Mexico from a drilling rig.
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Obama says BP is responsible and will clean up the spill.
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Oceanographers say some oil has entered an ocean current.
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US oil clear up will take years and underwater oil plumes are spreading.
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US Gulf oil drilling ban is blocked
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Adam Allen tell BP he is concerned of a seep near the well
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BP puts oil spill cost $32.2b
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The US government says the spill is the biggest with 4.9 million barrels leaked.
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A study confirm presence of toxic chemical residue in the Gulf of Mexico
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The well is sealed and closed
