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NYC Active Shooter Drill

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NYC-Terror Drill

In an abandoned subway station in a Lower Manhattan, police stage a drill simulating a terrorist attack Sunday Nov. 22, 2015, in New York. Following the Nov. 13 terror attack in Paris and four days before New York's Macy’s Thanksgiving Day Parade, emergency responders from the NYPD, Fire Deptartment of New York and Homeland Security participated in the drill. (New York Police Department via AP)

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NYC-Terror Drill

New York police line up near an abandoned subway station in a lower Manhattan to stage a drill simulating a terrorist attack Sunday, Nov. 22, 2015, in New York. Following the Nov. 13 terror attack in Paris and four days before New York's Macy’s Thanksgiving Day Parade, emergency responders from the New York Police Department, Fire Department of New York and Homeland Security participated in the drill. (New York Police Department via AP)

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NYC-Terror Drill

In an abandoned subway station in a lower Manhattan, emergency responders stage a drill simulating a terrorist attack Sunday, Nov. 22, 2015, in New York. Following the Nov. 13 terror attack in Paris and four days before New York's Macy’s Thanksgiving Day Parade, members of the NYPD, Fire Deptartment of New York and Homeland Security participated in the drill. (New York Police Department via AP)

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NYC-Terror Drill

Following an active shooter drill in an abandoned subway station, from left, Fire Commissioner Daniel A. Nigro, Mayor Bill de Blasio and U.S. Secretary of Homeland Security Jeh C. Johnson listen as Police Commissioner William J. Bratton, center, addresses a news conference in New York, Sunday Nov. 22, 2015. Following the Nov. 13 terror attack in Paris and four days before New York's Macy’s Thanksgiving Day Parade, emergency responders from the New York Police Department, Fire Deptartment of New York and Homeland Security participated in the drill. After the Pairs attacks, Bratton warned that the city could be the next target. (NYPD via AP)