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Baseball cap clue: Boston bombing investigators have a ‘face, not a name’

Updated, April 18, 6:07 p.m.

FBI crime scene investigators stand near an evidence marker on Boylston Street just past Berkeley Street as they sweep up towards the bomb scene of the Boston Marathon April 17, 2013 in Boston, Massachusetts. (Photo by Darren McCollester/Getty Images)
FBI crime scene investigators stand near an evidence marker on Boylston Street just past Berkeley Street as they sweep up towards the bomb scene of the…Getty Images

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