NEW YORK, NY - DECEMBER 31:  New York Police Officers keep an eye on people while they arrive at Times Square before New Year's Eve celebrations on December 31, 2015 in New York City. At least 6,000 police officers has being deployed in one of the biggest security deployments made in the city, where rooftop snipers, canine units and air and water patrols will also be on duty around Times Square in what New York City Mayor Bill de Blasio said "the best prepared city to prevent terrorism and to deal with any event that could occur." (Photo by Eduardo Munoz Alvarez/Getty Images)