US and Canada braced for more snow storms
6 January 2014 Last updated at 05:23 GMT
Parts of the north-eastern United States and Canada are bracing themselves for more heavy snow and freezing temperatures, as a "polar vortex" envelops half of the continent.
Forecasters are predicting that parts of the Mid-West could see record-low temperatures in the coming days.
Wendy Urquhart reports.