Despite multiple photos and surveillance video images of two suspects involved in the Boston Marathon bombings last month, as well as state-of-the-art facial-recognition software and two government databases, investigators were unable to identify the two suspected perpetrators, even after releasing several of the images to the public.
It was only after one suspect was shot in a showdown with police and was fingerprinted on his way to the hospital that authorities finally had a name to go with a face

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