Warnings as record heatwave hits US states
7 July 2012 Last updated at 08:33 BST
Parts of the US are baking in record heat as nearly half a million people remain without power a week after severe storms.
The National Weather Service forecast "dangerously hot temperatures" this weekend in a dozen states from the Midwest to mid-Atlantic.
The heat index is predicted to hit 112F (44C) in some areas.
The sweltering weather has been blamed for 13 deaths so far, according to US officials.
Bill Hayton reports.