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    U.S. faces dangerous heat wave, record-breaking temperatures

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U.S. faces dangerous heat wave, record-breaking temperatures

01:58

Tens of millions of people are under heat alerts across the U.S. with temperatures in the 90s in all pockets of the country. Cities in the Northeast are seeing record highs and Dallas is facing triple digits for the 39th time this summer. NBC News’ Sam Brock has more.