Hualapai Nation Police Chief Francis Bradley said the crash happened Saturday night near Quartermaster Canyon on the Hualapai Nation about 60 miles west of Peach Springs, Ariz.
"Four survivors being treated at the scene, all Level 1 "critical". can't be airlifted because conditions too windy", he tweeted. Fox News adds word from the Federal Aviation Administration that the helicopter sustained substantial damage when it hit the ground.
Six passengers and a pilot were on board the Papillion Grand Canyon Helicopters chopper when it crashed.
He earlier told USA media that the local terrain had hampered rescue efforts overnight.
Rescuers got help from military aircraft from Nellis Air Force Base in Las Vegas and were eventually able to fly all four of the injured to the University Medical Center in Las Vegas by Sunday morning, Bradley said.
'Our pilot and other pilots all started running, ' he said.
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Fujimoto said he saw two badly injured women and one of them was yelling out a man's name.
The helicopter was operated by tour company Papillon Airways. "By the time they did, most of the fire was out".
On its website, Papillon Airways calls itself as "oldest Grand Canyon helicopter sightseeing company". It notes that it "abides by flight safety rules and regulations that substantially exceed the regulations required by the Federal Aviation Administration".
Mr. Robb said his heart went out to the victims.
KNXV-TV reported that the helicopter passengers were touring the massive park.