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  Boston (CNN) — Two young men with backpacks walked with purpose down Boylston Street Monday afternoon, weaving through the crowd on the sidelines of the Boston Marathon. It seemed like they’d been there before, like they knew where they were going. The one in the white cap reached his destination first, about two blocks […]

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Recovered unexploded devices could provide a treasure trove of information for investigators such as fingerprints and indications of how the exploded bombs were designed, said the intelligence community law enforcement official. The bombs that did explode were small, and initial tests showed no C-4 or other high-grade explosive material, suggesting the packages used in the […]