Nearly one and a half million people are without power across several states as a powerful Arctic winter storm sweeps through the US and Canada.
Large parts of both countries are under winter weather alerts that stretch from coast-to-coast and as far south as the US-Mexico border.
More than 200 million people are under weather warnings or advisories during one of the busiest travel periods of the year.
Major airports have cancelled thousands of flights as the storm intensifies.
Forecasters have said temperatures could plunge as low as minus 57 degrees Celsius in some parts of the country.
Experts warn this could lead to frostbite within five to 10 minutes.
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