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D.C. region stays on high alert after Boston bombings

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Confronted by a distressing human toll in Boston and comforted by few answers from investigators, D.C.-area officials were on heightened alert Tuesday, even as they sought to reassure residents and visitors that they knew of no threats to the region. "You're not going to see a lot of security presence because much of the security that we put in place isn't visible," D.C. Mayor Vincent...