NEW ORLEANS — Government officials said late Wednesday night that oil might be leaking from a well in the Gulf of Mexico at a rate five times that suggested by initial estimates. In a hastily called news conference, Rear Adm. Mary E. Landry of the Coast Guard said a scientist from the National Oceanic and Atmospheric Administration had concluded that oil is leaking at the rate of 5000 barrels a day, not 1000 as had been estimated. While emphasizing that the estimates are rough given that the leak is at 5000 feet below the surface, Admiral Landry said the new estimate came from observations made in flights over the slick, studying the trajectory of the spill and other variables. An explosion and fire on a drilling rig on April 20 left 11 workers missing and presumed dead. The rig sank two days later about 50 miles off the Louisiana coast. Doug Suttles, chief operating officer for exploration and production for BP, said a new leak had been discovered as well. Officials had previously found two leaks in the riser, the 5000-foot-long pipe that connected the rig to the wellhead and is now detached and snaking along the sea floor. One leak was at the end of the riser and the other at a kink closer to its source, the wellhead. But Mr. Suttles said a third leak had been discovered Wednesday afternoon even closer to the source. Im very, very confident this leak is new, he said. He also said the discovery of the new leak had not led them to believe that the total flow from the well

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