Terrorism strikes Boston Marathon as bombs kill 3, wound scores - CNN.com - 1 views
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In addition to scrutinizing images of surveillance cameras in the area, the FBI likely was issuing subpoenas for records from cell towers in the area to isolate and trace calls from around Copley Square at the time of the blasts, according to a former federal law enforcement official who now works in the intelligence community.
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P Yim on 11 Dec 13Digital Tool - Surveillance cameras - Cell Towers
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CNN article pre apprehension of suspect(s)
