Reuters: A BP Plc investigation of the Gulf of Mexico disaster played down the company’s role in the world’s worst offshore oil spill, seeking to share the blame with its contractors. The 193-page internal report made public on Wednesday drew fire from U.S. lawmakers and one of the contractors, Transocean, called it a “self-serving” attempt by the British energy giant to escape responsibility for the “fatally flawed” design of its deepsea Macondo well. The report threatened to reignite …