Rooftop Snipers. Helicopters. A Hostage Team. Las Vegas Gears Up for New Year's Eve.

LAS VEGAS — With their rifles at the ready for an active shooter, Sgt. Charles Jivapong and half a dozen other police officers moved quickly through an industrial building not far from the airport here, trying to determine which victims were alive and which were too far gone to be saved. This time, it was a …
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