Fear for life as US braces for -50C 'polar vortex'

Icy air and gusting winds are expected to bring temperatures down as low as -50C in parts of the US with forecasters warning the Arctic grip could be life threatening.

The "polar vortex" - a rotating pool of cold, dense air - has brought the coldest weather in 20 years to the Mid-West.

ITV News' Lewis Vaughan-Jones reports from a nation bracing itself for the bitterest of weather:

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US temperatures set to plummet to record lows

Parts of America and Canada are experiencing near record-breaking low temperatures from a severe winter storm that has claimed at least 16 lives.