Associated Press
David Helson, National Transportation Safety Board (NTSB) Investigator in Charge, seated right, speaks during a hearing investigating a battery fire aboard a Boeing 787, Tuesday, April 23, 2013, at the NTSB in Washington. Also pictured are Boeing Commercial Airplanes Vice President and Chief Project Engineer Mike Sinnett, seated second from left, and NTSB Chairman Deborah Hersman, top third from left. (AP Photo/Charles Dharapak)

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