Investigators looking into BP's Gulf of Mexico oil spill have accused one of the energy giant's suppliers of obstructing the inquiry.
The White House oil spill commission said that National Oilwell Varco (NYSE: NOV - news) is not cooperating with its requests for information.
US officials need the company's help to recreate what the crew who died in the accident might have seen on their monitors in the moments before the Deepwater Horizon rig exploded. The accident, on April 20, killed 11 men.



