National Transportation Safety Board Chairman Deborah Hersman questions witnesses during a hearing in Washington, Wednesday, March 2, 2011, to gather additional factual information for the ongoing ... more 
National Transportation Safety Board Chairman Deborah Hersman questions witnesses during a hearing in Washington, Wednesday, March 2, 2011, to gather additional factual information for the ongoing investigation into the natural gas pipeline rupture and explosion that occurred in September 2010 in San Bruno, Calif. less 
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Associated Press | Photo By Cliff Owen
Wed, Mar 2, 2011 7:29 PM EST