Warnings as record heatwave hits US states

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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.

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