The coldest blast of arctic air has swept across some of United State's biggest cities. Schools were shut, public transport hit and office-goers delayed across the Midwest and New England because of below-zero temperatures.
A blast of Arctic air from the polar vortex has brought dangerous, bone-chilling cold to a wide swath of the United States on Tuesday, stretching from the Dakotas through Maine, with snow expected as far south as Alabama and Georgia. Arctic air and icy conditions led schools to close, flights to be cancelled and railway officials to set fires on train tracks to prevent them from cracking.
Temperatures dipped as low as -19 degree Fahrenheit (-28 degree Celsisus) -- breaking the city's previous cold weather record for that day set in 1966.
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