With a tropical storm approaching, hundreds of workers and more than a dozen vessels will begin moving from the Deepwater Horizon blowout site Friday, stopping work on the long-awaited final "kill" of the well for more than a week.

The decision to begin the evacuation was made late Thursday by retired Coast Guard Adm. Thad Allen, the national incident commander, after concluding that Tropical Storm Bonnie would likely hit the site with winds above 40 mph on Saturday morning.

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