A New York City sightseeing helicopter has broken apart in midair and crashed into the Hudson River, killing six people.

Cities in California, Texas and Arizona are expecting air quality to become unhealthy for sensitive groups on Thursday.

A helicopter crashed in the Hudson River in New York City on Thursday afternoon, according to the New York Police Department.

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Officials say multiple people are dead in the Hudson River chopper crash today, according to sources. At least five people, including three children, were aboard the helicopter that went down closer ...

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