BP Begins 'Top Kill' Oil Spill Containment, Plugging Well with Mud and Cement

The "top kill" is under way. BP has begun pumping heavy mud into the blown-out well in the Gulf of Mexico in an attempt to seal it. Cement will follow. The top kill has never before been tried a mile beneath the sea, and company officials say it could be a couple of days before they know whether it is working. BP's top executive has pegged the chance of success at 60% to 70%.

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