US Rep. Bart Stupak (D-Michigan), head of the House Subcommittee on Oversight and Investigations, has said the Deepwater Horizon's blowout preventer had a leak in its hydraulic system and the device was not powerful enough to cut through joints to seal the drill pipe.

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He made the statement after getting comments from company officials from Halliburton, Transocean and BP in a hearing on the disaster and the continuing oil spill. Stupak also said the panel has evidence the BOP had been modified, which made it difficult to operate after the accident.