The mayor of Philadelphia says the city is on a heightened level of security following Monday's explosions near the finish line of the Boston Marathon but said there have been no specific threats in

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The mayor of Philadelphia says the city is on a heightened level of security following Monday's explosions near the finish line of the Boston Marathon but said there have been no specific threats in or against the city.

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WPVI – Philadelphia
Mon, Apr 15, 2013 7:34 PM EDT