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Attorney General Eric Holder said Tuesday that he has launched a criminal investigation into the Gulf of Mexico oil spill. BP began its latest attempt to curtail the flow of oil from an underwater well in the Gulf of Mexico on Tuesday, using robot submarines to cut into a damaged pipe a mile down. The operation carries the risk that the flow of crude from the ruptured well, already the largest oil spill in U.S. history, will increase. But if successful, the company says it will be able to catch most of that oil with a cap it plans to place over the severed lower marine riser pipe. "Even with an increased flow rate, this cap will be able to handle this," BP Managing Director Bob Dudley told CNN's "American Morning." While the engineering has never been attempted at a depth of 5,000 feet, Dudley said Tuesday the latest attempt is "more straightforward" than previous, unsuccessful efforts.