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By Jonathan Allen and Barbara Goldberg NEW YORK/MAPLEWOOD, N.J. (Reuters) - A massive, wind-whipped blizzard slammed into the U.S. Northeast on Monday, creating havoc for more than 60 million people and forcing New York City to shut down on a scale not seen since Superstorm Sandy devastated the region in 2012. The potentially historic storm which could affect 20 percent of the U.S. population, caused at least six states up and down the East Coast to declare emergencies, forced the cancellation of thousands of flights, closed schools and major mass transit systems - including the New York City subway. Coastal flood warnings were issued, with tides in the New York metro area expected to be as much 3 feet higher than normal early Tuesday morning. BRIDGES, TUNNELS CLOSE Driving bans in New York, Connecticut and Massachusetts brought the region to a standstill amid near white-out conditions, with the George Washington Bridge, Lincoln and Holland tunnels as well as major mass transportation throughout the city closing at 11 p.m ET (0400 GMT).