Boston Marathon Bombing

DHS: No Evidence of a Broader Bomb Plot

But will maintain more security at transportation centers for now

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Homeland Security Secretary Janet Napolitano says there is no evidence that the bombings at the Boston Marathon are part of a wider plot.

Napolitano says DHS will maintain what she called "enhanced security measures at transportation hubs" as a precaution.

Two people briefed on the investigation tell The Associated Press that a pair of bombs packed into pressure cookers and concealed in duffel bags blew up within seconds of each other.