"It was just frightful", he said. The other was clad in her underwear and was burned all over. "It's unimaginable, the pain".
ABC 15 Arizona reports that dispatchers at the Hualapai Department of Emergency Services confirm three people were killed and others were injured.
Papillion Airways is based in the Las Vegas area.
He said National Transportation Safety Board officials were expected at the crash scene to begin investigating the cause.
FAA spokesman Allen Kenitzer earlier said the aircraft sustained considerable damage in the crash.
"People on call must be flown in and stroll to the crash site", he said.
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Mr. Robb said his heart went out to the victims.
"In the gulch, there was a helicopter, flames, smoke", he said. "Her clothes probably were burnt off", Fujimoto told KSNV.
The tour company released a statement Sunday, promising full co-operation with crash investigators and offering sympathy.
"We are in the recovery and investigation mode now", Mr Bradley said. "Our top priority is the care and needs of our passengers and our staff".
A Foreign Office spokeswoman said: "We are providing support to the families of six British visitors involved in a helicopter accident at the Grand Canyon on February 10, and we are in close contact with the USA emergency services". It additionally noticed that it "submits to flight wellbeing guidelines and directions that significantly surpass the controls required by the Federal Aviation Administration".
NTSB records show a helicopter operated by Papillon was involved in a deadly crash on August 10, 2001, near Meadview, Arizona. The pilot and five travelers dead.