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"This is troubling, both in light of BP's frequently stated public commitment to openness and a fair investigation, and because it appears that BP is withholding evidence in an attempt to prevent any entity other than BP from investigating the cause of the April 20 incident and the resulting spill," the letter said. Copies of the letter were also sent to government agencies and lawmakers investigating the spill's cause.
In a sternly worded letter obtained by The Associated Press, Transocean says that lack of information is preventing the company from informing state and federal investigators, and the families of those killed on the rig, about what happened.
According to the rig's owner, BP appears to be preventing any other entity from investigating the blowout.
Transocean also reveals that it reluctantly signed a confidentiality agreement at BP's request to obtain some limited data.
BP didn't immediately return calls for comment.