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Heavily armed New York city police officers with the Strategic Response Group stand guard at the armed forces recruiting center in New York's Times Square, Saturday, Nov. 14, 2015.  Police in New York say they've deployed extra units to crowded areas of the city "out of an abundance of caution" in the wake of the attacks in Paris, France. A New York Police Department statement released Friday stressed police have "no indication that the attack has any nexus to New York City." (AP Photo/Mary Altaffer)
Heavily armed New York city police officers with the Strategic Response Group stand guard at the armed forces recruiting center in New York's Times Square, Saturday, Nov. 14, 2015.  Police in New York say they've deployed extra units to crowded areas of the city "out of an abundance of caution" in the wake of the attacks in Paris, France. A New York Police Department statement released Friday stressed police have "no indication that the attack has any nexus to New York City." (AP Photo/Mary Altaffer)

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    U.S. cities ramp up security following Paris attacks

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U.S. cities ramp up security following Paris attacks

Police departments in major U.S. cities are ramping up their patrols after new ISIS video threatens to strike in America. CNN's Deborah Feyerick reports.

U.S. cities ramp up security following Paris attacks

Police departments in major U.S. cities are ramping up their patrols after new ISIS video threatens to strike in America. CNN's Deborah Feyerick reports.