Parts of the US prepares for record-breaking low temperatures
Images from the snowstorms sweeping across the north-east of the US.
Cars were covered with snow at Chicago's O'Hare International Airport, which saw major delays and cancellations because of the storm.
In the Canadian state of Michigan, the Winter Classic outdoor NHL hockey game against Detroit Red Wings and the Toronto Maple Leafs went ahead despite the state seeing up to 10in of snow fall.
More than 2,200 flights were cancelled on Thursday, and by the early hours of Friday a further 1,730 flights scheduled for later in the day had already been cancelled, according to FlightAware.com.
A man walks past waves crashing against the seawall in Lynn, Massachusetts. Weather officials have also issued a blizzard warning for the Long Island region of New York, where up to 10in of snow is expected.
People across the north-east have been buying lots of shovels and salt. Residents have been warned not to spent too much time outside because of the freezing temperatures.
Heavy snowfall was also expected in parts of the states of Vermont, New Hampshire and Maine, where many residents were recently without electricity because of an ice storm.
Forecasters say temperatures in the US Mid-West could feel as low as -50C with the effect of wind chill.
Emergency workers respond to a vehicle that slid off the road.
In New Jersey, residents were urged to stay home as temperatures reached below minus 20C.
A winter storm has already covered areas of Canada and the north-eastern US with up to 60 cm of snow.