A Massachusetts congressman says investigators still don't know whether the Boston Marathon bombs were the work of domestic or foreign attackers.
Democratic Rep. William Keating says Homeland Security Secretary Janet Napolitano (neh-pahl-ih-TAN'-oh) told him Tuesday that there was no intelligence chatter before the attack Monday that killed three people and wounded more than 170 others. No one has taken responsibility for the twin bomb blasts.
Earlier Tuesday Napolitano said there also was no evidence that the Boston attack was part of a broader plot.
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