At least 28 people have died in the US as the country grapples with a brutal winter storm.
Blizzard conditions have left almost 300,000 homes and businesses without power, as temperatures plunge to well below freezing.
More than 3,000 flights were cancelled on Saturday, with some airports closed.
On Friday more than 200 million people were under some form of weather warn
Warning of 90mph winds and 20cm of snow
Icy conditions on the roads prompted many authorities to warn against non-essential travel, and hundreds of people who did venture out found themselves stranded in their vehicles.
Among those who have died are three people in car crashes in Kentucky, and another three in Oklahoma, two of which happened as winds blew the drifting snow.
In Montana, the National Weather Service warned that the eastern slope of Glacier National Park and nearby foothills and plains could see up to 20.3cm of snow and winds of up to 90mph.
Montana saw a temperature of -45.6C (-50F) earlier in the storm, while yesterday’s low belonged to the remote town of Havre – also in Montana – which saw -39C (38F).
In Maine, more than 107,000 properties are without power and utility bosses have warned it could take days before supply is fully-restored, while some other states have asked customers to cut back on their usage to avoid rolling blackouts.
ing.