BP Announces Success of 'Static Kill'

The operation was "textbook.

It went exactly as we would have expected," a BP exec told CNN, adding that the firm's engineers won't decide whether or not to follow the mud with cement until after the relief well is completed next week. "I think all of our hopes and aspirations are that this thing will come to an end," said retired Coast Guard Adm. Thad Allen. "It's been an agonizing period for the people of the Gulf and the United States."

With its well-killing effort reported to be going "extremely well," BP plans to start pouring concrete into the crippled well in the Gulf of Mexico on Thursday.

The U.S. official overseeing the response to the spill, retired Adm. Thad Allen, has given BP a green light to pour cement on top of the 2,300 barrels of heavy drilling mud already sent down the well. The mud drove oil back into the reservoir in an operation known as a "static kill."