FILE – Dec. 31, 2016 file photo, revelers take part in the New Year’s Eve celebration in New York’s Times Square as seen from the Marriott Marquis. A Las Vegas shooting from a high-rise hotel that killed dozens of people
FILE – Dec. 31, 2016 file photo, revelers take part in the New Year’s Eve celebration in New York’s Times Square as seen from the Marriott Marquis. A Las Vegas shooting from a high-rise hotel that killed dozens of people in a packed concert below on Sunday, Oct. 1, 2017, has forced other cities to examine their tactics for dealing with this kind of nightmare scenario. In New York, which hosts Times Square New Year’s Eve and other events surrounded by high-rises, police say they use rooftop snipers to scan for threats, and make security sweeps of nearby hotels. (AP Photo/Mary Altaffer, File)