April, 15th, 2013, New York, NY, USA : The NYPD are on high alert due to the explosions at the Boston marathon where two people were killed and at least two dozen were injured. Credit: Scott Houston /Alamy Live News

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Photo credit: © Scott Houston / Alamy / Afripics
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Keywords: alert, alert., boston, explosions, high, marathon, nyc, nypd, securety, terrorism