The Maricopa County medical examiner has released the initial results of the 19 fallen firefighters' autopsies, showing all of the men died from burns and inhalation problems.
The medical examiner's office in Phoenix issued the finding Thursday, two days after performing the autopsies.
The firefighters were deployed Sunday to what was thought to be a manageable lighting-caused forest fire near the small town of Yarnell, but violent winds turned the fire. The blaze killed the Prescott Granite Mountain Hotshot team.
An investigation is underway to find out what went wrong.
Federal investigators are back out on the mountain Thursday, searching the scene for more evidence.
They're trying to determine if there were any equipment failures, whether any decisions were made that ended up putting the firefighters at greater risk or if Mother Nature was just so unpredictable that nothing could have saved them.
"They were in a safety zone. (We) can't say for sure whether it was in the safety zone they had selected," Fire investigator Mike Dudley said.
"We look at the decisions made. We look at fuels ... the weather," Fire investigator Jim Carle said during a news conference Wednesday.
Fire officials said the goal of the investigation is to make sure nothing like this ever happens again.
Stay with cbs5az.com for updates on the investigation.
Copyright 2013 CBS 5 (KPHO Broadcasting Corporation). All rights reserved.
UPDATEYarnell Hill Fire: Burns, breathing issues killed 19 firefightersMore>>
Thursday, July 24 2014 4:23 PM EDT2014-07-24 20:23:25 GMT
The Yavapai County Medical Examiner has confirmed the identities of four people who died after a single-engine plane crashed in rough terrain northwest of Sedona on Sunday.More >
The victims were the pilot, Jonathan McGeary, 22, of Flagstaff; Levi Wallace, 23, of Prescott; Johanna Naber, 18, of Shellbrook, Saskatchewan Canada; and Sabrina Giebelen, 19, of Krefeld, Germany.More >
Tuesday, July 15 2014 1:59 PM EDT2014-07-15 17:59:16 GMT
Use of cables and helicopters to drag and lift logs from forest slopes are among thinning alternatives under consideration to protect Flagstaff from wildfire and its watershed from flooding.The ArizonaMore >
Use of cables and helicopters to drag and lift logs from forest slopes are among thinning alternatives under consideration to protect Flagstaff from wildfire and its watershed from flooding.More >
Tuesday, July 8 2014 1:22 PM EDT2014-07-08 17:22:26 GMT
President Barack Obama is asking Congress for $615 million to help fight wildfires as the summer season is already prompting blazes across western states.The White House said Obama will submit the requestMore >
President Barack Obama is asking Congress for $615 million to help fight wildfires as the summer season is already prompting blazes across western states. More >
Friday, June 27 2014 12:05 PM EDT2014-06-27 16:05:07 GMT
Here's a look at the wildfires that have flared up and burned acreage in Arizona this wildfire season, according to the Arizona Interagency Wildfire Prevention. Odonnell Fire - April 21 Brown Fire -More >
Here's a look at the wildfires that have flared up and burned acreage in Arizona this wildfire season, according to the Arizona Interagency Wildfire Prevention.More >
Wednesday, June 25 2014 1:03 PM EDT2014-06-25 17:03:16 GMT
Firefighters have reopened all roads around a wildfire that has scorched nearly 23 square miles of terrain on the Navajo Nation just east of the Arizona-New Mexico border.Navajo Nation officials say roadwaysMore >
Firefighters have reopened all roads around a wildfire that has scorched nearly 23 square miles of terrain on the Navajo Nation just east of the Arizona-New Mexico border.More >
They were born just two weeks apart. A 10-week-old baby and 8-week-old pit bull have a fascinating relationship. They absolutely adore each other! Louisiana native Brandi Hodges, 25, has posted photosMore >
A 10-week-old baby and 8-week-old Pitbull have a fascinating relationship. They absolutely adore each other!More >
Monday, July 28 2014 2:08 PM EDT2014-07-28 18:08:17 GMT
NWS: Macroburst hit north Phoenix with 100 mph winds
A macroburst with winds in excess of 100 mph hit north Phoenix Saturday night, snapping power poles, toppling trees and cutting power to 33,000 utility customers, the National Weather Service said.More >
Intense macrobursts can cause tornado-force damage of up to F3 intensity, the National Weather Service said after it confirmed the event. The Paradise Valley Hospital sustained rooftop damage.More >
Monday, July 28 2014 1:54 AM EDT2014-07-28 05:54:27 GMT
Authorities now say 14 people - including a 15-year-old - have been struck by lightning during rare summer thunderstorms that have swept through Southern California, injuring two critically.More >
A 20-year-old man died Sunday after lightning struck or rattled 13 people at a popular Los Angeles beach and a golfer on Catalina Island during summer thunderstorms that swept through Southern California, authorities said.More >