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Input: Police Chief Francis E. Bradley of the Hualapai Nation Police Department said in a statement that the accident occurred around 5:20 p.m. local time near Quartermaster Canyon on the Hualapai Nation  a federally recognized Indian reservation in northwestern Arizona.
The survivors of the EC-130 helicopter wreck were all "Level One trauma patients " said  Bradley   indicating the highest category of injury.
Rescue workers had difficulty accessing the scene  said  Bradley   owing to "high winds  the darkness  and the extreme rugged terrain."
 He  added  "The only access to the crash site area is by foot on a 20-mile hike or by helicopter."

4 Killed In Grand Canyon Helicopter Crash