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Grand Canyon helicopter crash kills 3

Three people were killed and another four injured when a sightseeing helicopter crashed in the Grand Canyon Saturday evening.

The helicopter was about a mile deep in the canyon when it "crashed under unknown circumstances," taking "substantial damage," said Federal Aviation Administration (FAA) representative Allen Kenitzer in a statement. "Local authorities say that at least seven people were on board the helicopter," Kenitzer added.

The FAA will conduct an investigation in cooperation with the Hualapai Nation police.