At least 12 people have been killed across the USA after temperatures dropped below -45°C in some of the states due to the bomb cyclone, just ahead of the holiday weekend.

Bomb cyclone brings sub-zero chills in US: 12 killed, 4,400 flights cancelled day ahead of Christmas

Feel cold yet? Massive winter storm set to wreck holiday travel plans in US

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Bomb cyclone brings sub-zero chills in US: 12 killed, 4,400 flights cancelled day ahead of Christmas

Feel cold yet? Massive winter storm set to wreck holiday travel plans in US