Napolitano: No sign Boston blasts part of broader plot

WASHINGTON - US Homeland Security Secretary Janet Napolitano said on Tuesday there was no indication that the bomb blasts in Boston, which killed three people and wounded more than 150, were part of a broader plot.
Napolitano said that "out of an abundance of caution" the authorities would keep increased security measures - seen and unseen - in place at transportation hubs.
She urged the American public to remain vigilant and to immediately report any signs of suspicious activity to local law enforcement officials.
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