"The decision to accept the test results as satisfactory without review by adequately trained shore-based engineering or management personnel suggests a lack of discipline and clearly defined responsibilities," it said.

In addition, several clear failures in monitoring of the well appear to have contributed to its blowout, making ignition "most likely," the report said, adding that the failure of the blowout preventer and several questionable decisions made about the cement process are also factors in the blowout.

A final report is due in the summer of 2011.

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