US President Barack Obama has ordered a tripling of manpower in coastal areas where oil has washed ashore or threatens to within 24 hours.
Speaking on a tour of oil-hit areas, Mr Obama said the US would "do whatever it takes" to help those affected.
The oil company BP says operations to seal the hole in the damaged well is continuing.
BP chief executive Tony Hayward said the outcome would not be clear for another 48 hours.
He said the new "top kill" effort - untested before at this depth of 5,000ft (1.5km) - was "going pretty well according to plan".
Mr Obama said the additional manpower would lay more booms, clean beaches and monitor stricken wildlife. -bbc
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