The Gulf of Mexico oil spill is the worst environmental disaster the US has faced, a senior official has said.
White House energy adviser Carol Browner also said the US was "prepared for the worst scenario" that the leak might not be stopped before August.
BP is to try a new tactic after its...
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Oil giant BP says it is unsure whether its latest attempt to plug a gushing oil well in the Gulf of Mexico has succeeded.
Chief operating officer Doug Suttles said the "top kill" operation had not yet stopped the flow and it was preparing its next plan.
Millions of gallons of oil have leaked...