A helicopter carrying at least seven people crashed in the Grand Canyon Saturday evening.
Authorities say the four were level 1 trauma patients. Fox News adds word from the Federal Aviation Administration that the helicopter sustained substantial damage when it hit the ground.
He did not have details of the crash.
Images emerged on Twitter of flames and thick black smoke rising from among the layers of rock at the scene of the crash.
The helicopter was operated by Papillon Airways, an aerial sightseeing company that gives tours of the Grand Canyon and other locations, Bradley said.
National Weather Service meteorologists in Flagstaff and Phoenix said wind conditions were an expected 10 miles per hour with whirlwinds miles per hour around the season of the crash.
The incident was confirmed to have occurred in the Grand Canyon West area at about 00:20 GMT.
The helicopter was on a tour of the canyon and more than a mile deep when it went down, Reuters reported, citing information from KNXV-TV.
"Quartermaster Canyon is an extremely remote area".
"By 7 a.m., just boom!"
Still, unwanted doesn't necessarily mean unsafe. A helicopter crew from Nellis Air Force Base assisted the effort but one of the two helicopters from the Arizona Department of Public Safety was grounded. He told AP that the company has made improvements since then.
"They've improved their piloting qualifications as well as their maintenance over the last 10 years and as far as I know they've not had a crash since 2001", he said.