United states president barack obama is briefed on the 2013 boston marathon explosions, in the oval office, on 16 april 2013. Seated, from left, are: homeland security secretary janet napolitano; tony blinken, deputy national security advisor; jake sullivan, national security advisor to the vice president; attorney general eric holder; lisa monaco, assistant to the president for homeland security and counterterrorism; chief of staff denis mcdonough; and fbi director robert mueller.
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