Chicago's residents brace themselves for big freeze

Large parts of the United States are bracing for freezing cold as a polar vortex is expected to drive temperatures to as low as -50C.

In Chicago, residents have been battling the elements as at least 20 centimetres of snow fell on Sunday.

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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.