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A metro SWAT officer stands guard on Massachusetts Avenue near the scene of multiple bombings near the finish line of the Boston Marathon in Boston, Massachusetts

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10 a.m. UPDATE: Investigators Hunt For Clues In Marathon Bombing

Two bombs packed with ball bearings tore through crowds near the finish of the Boston Marathon, killing three people and triggering a massive hunt for those behind an attack the White House said would be treated as "an act of terror".

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