A whirlpool of freezing, dense air known as a "polar vortex" has gripped the US Midwest and is making its way east and south, bringing record low temperatures.
Thermometers plunged to -32C (-25F) in Fargo, North Dakota, while Madison, Wisconsin, hit -28C (-19F) and even Chicago and Minneapolis saw temperatures reach -20F, with wind chills of -50F.
Forecasters say some 187 million people could feel the effects of the frigid blast by the time it has spread across the country.
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