Severe snowstorms paralyze USA as arctic blast sets in

Millions of Americans are under severe weather warnings as a major winter storm moves across the US. Freezing Arctic air is bringing blizzards and icy winds to much of the country as it pushes south-east. Forecasters are warning that temperatures could plunge as low as minus forty-five degrees celsius in some areas. The record-breaking cold comes as millions hit the roads and the skies for the holidays. Airlines have already cancelled thousands of flights.