The long-awaited trial of BP for the biggest U.S. offshore oil spill began on Monday, with governments, businesses and individuals blaming the company for the 2010 disaster that killed 11 rig workers and spilled 4 million barrels of oil into the Gulf of Mexico.

"Not only was it within BP's power to prevent the tragedy, it was its responsibility," Assistant U.S. Attorney Mike Underhill said at the trial over legal culpability for the blowout and spill.

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