Panic-buyers flood grocery stores 'historic' blizzard threatens
More than 1,400 flights have been canceled for Monday, and a further 1,000 on Tuesday
The National Weather Service has issued a warning for the East Coast covering 29million people
New York City Mayor Bill de Blasio said 'This could be a storm the likes of which we have never seen before'
Boston is expected to get 18 to 24 inches of snow, and Philadelphia 14 to 18 inches
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