FBI Director Robert Mueller listens on Capitol Hill in Washington, Thursday, April 11, 2013, during the House Intelligence Committee hearing on worldwide threats. Mueller was among intelligence agency heads who testified before the committee. (AP Photo/Manuel Balce Ceneta)

Associated Press
FBI Director Robert Mueller listens on Capitol Hill in Washington, Thursday, April 11, 2013, during the House Intelligence Committee hearing on worldwide threats. Mueller was among intelligence agency heads who testified before the committee.  (AP Photo/Manuel Balce Ceneta)
FBI Director Robert Mueller listens on Capitol Hill in Washington, Thursday, April 11, 2013, during the House Intelligence Committee hearing on worldwide threats. Mueller was among intelligence agency heads who testified before the committee. (AP Photo/Manuel Balce Ceneta)
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