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.


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.