September 8, 2010 7:39 PM

BP investigation cites multiple failures, but not well's design

A BP internal investigation released Wednesday concludes that eight key factors contributed to the explosion of the Deepwater Horizon oil rig in the Gulf of Mexico, including a poor cement job by Halliburton and the failure by Transocean workers to notice for 40 minutes that oil and gas were gushing into the well.

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