Heightened Transit Security Visible in Wake of Boston Bombings | NBC4 Washington
[NATL]Terror in Boston: Boston Marathon Explosions

NATL

Three Dead, Hundreds Injured After Explosions Near Marathon Finish

Heightened Transit Security Visible in Wake of Boston Bombings

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    Washington-area transportation agencies are working with their counterparts across the country to heighten security. News4 transportation reporter Adam Tuss has the story.