A snow storm that has swept across the central U.S. and upper midwest is blamed for at least 11 deaths.
Heavy snow, ice and fog Saturday and Sunday caused deadly road accidents and power outages. The storm also grounded flights for Christmas holiday travelers.
The winter weather forced about 300 cancellations at Chicago's busy O'Hare International Airport.
The National Weather Service on Sunday issued winter storm warnings for parts of the Great Lakes region bordering Canada, with snow and powerful winds in the states of Minnesota, Wisconsin and Michigan.
While precipitation was the most visible effect of the severe weather, bitter cold in some areas including the northern Plains where homes are still without power was more dangerous, with temperatures plunging below minus 17 degrees Celsius.
Weather forecasters say the bulk of the storms have moved to the east coast, where precipitation is falling mostly as rain.
Some information for this report was provided by AFP and AP.