A federal agency charged with investigating the explosion that led to the BP oil spill says it is so overburdened and understaffed it will have to close some investigations early and delay others to shift its staff to BP. The House Energy and Commerce Committee asked the U.S. Chemical Safety Board (CSB) to examine the Deepwater Horizon rig explosion. The board, which investigates chemical accidents, had probed a 2005 explosion at BP's Texas City refinery.

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