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Associated Press
From left, NYPD's Chief of Department James O'Neill, NYPD Commissioner Bill Bratton, and New York City Mayor Bill de Blasio, attend mass at St. Patrick's Cathedral, Sunday, Dec. 21, 2014, in New York. The previous day an armed man walked up to two New York Police Department officers sitting inside a patrol car and opened fire, killing both before running into a nearby subway station and committing suicide, police said. (AP Photo/John Minchillo)

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