Oil company BP shouldered some responsibility for the Gulf of Mexico oil disaster Wednesday after an internal investigation of the spill, but assigned much of the blame to contractors Halliburton and Transocean. Bad cementing, a misread pressure test and an badly maintained blowout preventer all added to the April 20 explosion that killed 11 workers aboard the Deepwater Horizon drill rig and led to the worst oil spill in U.S. history, BP's nearly 200-page report on the disaster concluded.

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