BP, partners face multiple probes | Bangkok Post: breakingnews

With a key piece of evidence raised from the depths of the Gulf of Mexico and BP's Macondo well ruled a threat no longer, the focus is shifting back to what went wrong and who is to blame.

Workers have retrieved the failed blowout preventer from BP's Macondo oil well, giving US investigators a key piece of evidence as they probe the reasons behind the biggest ever maritime spill.

The raising of the giant safety valve from the depths of the Gulf of Mexico will allow experts to study the device to determine why it crucially failed to shut off the well when BP's Deepwater Horizon rig exploded on April 20.