BP released a long-awaited report Wednesday on an internal investigation into the causes of its Gulf of Mexico oil well blowout, blaming multiple failures by BP and other firms but absolving its much-criticized well design.

The BP report stressed that "no single factor" caused the April 20 blowout that killed 11 workers, sank the Deepwater Horizon drilling rig and led to the largest oil spill in U.S. history.

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