A girl runs through a water fountain Washington DC 5 July 2012
Media playback is unsupported on your device
Video

Warnings as record heatwave hits US states

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.

Go to next video: US celebrates July 4 amid heatwave