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An explosion aboard the Deepwater Horizon drilling rig in the Gulf of Mexico
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Oil from the leaking well begins washing ashore in Louisiana
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Oceanographers say oil from the leak has entered an ocean current
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Carol Browner says the spill is the worst environmental disaster in US history,
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The commander of the US says clean-up of the oil-stricken Gulf could take years.
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A federal judge blocks the Obama administration's six-month moratorium on deepwater oil drilling in the Gulf of Mexico
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BP puts oil spill at $32.2 bn
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The US government says three-quarters of the oil spilled in the Gulf has been cleaned up or broken down by natural forces
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The blowout preventer that failed to stop the explosion on the Deepwater Horizon rig is removed from the stricken Gulf of Mexico oil well by BP
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The ruptured well is finally sealed and "effectively dead"