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.