Six passengers and a pilot were on board the Papillon Grand Canyon Helicopters chopper when it crashed under unknown circumstances on Saturday evening on the Hualapai Nation's land near Quartermaster Canyon, by the Grand Canyon's West Rim. Three of the seven have been killed and the other four were level-one trauma patients and still being treated at the scene.
Allen Kenitzer, of the Federal Aviation Authority's Office of Communications, said the aircraft sustained "substantial damage".
Photographer Teddy Fujimoto told DailyMail.com he had flown to the Grand Canyon to take wedding pictures when he saw people rushing by.
Images emerged on Twitter of flames and thick black smoke rising from among the layers of rock at the scene of the crash.
The FAA and the National Transportation Safety Board will be investigating.
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Crews will work Sunday to retrieve the bodies of those who died in the crash, Bradley said, but weather conditions were hampering efforts. The evacuation process was an overnight one and required military assistance from Las Vegas' Nellis Air Force Base.
It said it flies more than 600,000 people a year.
He said that's when two or three small explosions went off in the wreckage and people weren't sure what to do.
"Our pilot and other pilots all started running", he said. "We had to learn how to market Las Vegas", he said.
KNXV-TV reported that the helicopter passengers were touring the massive park.