Lt. Col. George Bivens points to images of the pipe bombs that police say were left by trooper ambush suspect Eric Frein in the Pennsylvania woods, at a news conference in Blooming Grove Pa., Tuesday Sept. 30, 2014. The bombs were not deployed, but they were fully functional and could have been set off by either a trip wire or a fuse, Bivens said. In background is John Brosnan, assistant special agent in charge of the FBI's Philadelphia office. (AP Photo/Michael Rubinkam)
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