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Transocean officials blasted the report as a self-serving attempt to conceal what they said was the real cause of the explosion - “BP’s fatally flawed well design.”

Halliburton said it found a number of omissions and inaccuracies in the report and is confident the work it completed on the well met BP’s specifications. “Contractors do not specify well design or make decisions regarding testing procedures, as that responsibility lies with the well owner,” the company said.

White House press secretary Robert Gibbs noted “there is an active investigation into what went wrong” and said the administration’s job is to find out what happened and hold those responsible accountable. Federal prosecutors are among those investigating.

AP correspondent Dina Cappiello contributed to this report from Washington.