At least nine people have died in the latest cold snap to sweep the United States, the second in two weeks. The storm piled snow high across the American midwest, with high winds creating deep drifts and closing airports. Hundreds of holiday season flights have been cancelled, stranding travellers trying to join families for christmas. Most of the deaths were from traffic accidents.
Tens of thousands of homes through several states are without power as the storm moves north over the great lakes.
Chicago airport is the worst hit by delays. With continuing high winds and freezing rain making roads dangerous and bringing down trees without warning, people are being advised not to travel if they can avoid it.