At least eight people have died in the US Midwest as the region shivers in the grip of its worst cold snap in decades.
An Iowa student found dead outside a college building is among the victims of the deadly freeze.
Hospitals have been treating patients reporting frostbite as life across a swathe of the nation grinds to a halt.
The iciest blasts may still come on Thursday. Ninety million people – a third of the US – have seen temperatures of -17C (0F) or below.
Some 250 million Americans overall have experienced the “polar vortex” conditions, but southern states such as Florida have escaped the brutal chill.