A record-breaking heat wave continued to grip the western United States on Tuesday, smashing records and endangering lives with little relief in sight. Approximately 162 million people -- nearly one-half of the US population -- were living in areas under active heat warnings, according to the National Weather Service.

Western US swelters under record-breaking heat wave

A huge swath of the United States will experience dangerously high temperatures, just ahead of the long Fourth of July weekend...

U.S. to face heat over fourth of July weekend

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Western US swelters under record-breaking heat wave

U.S. to face heat over fourth of July weekend