PRESCOTT, Ariz. (AP) - Trapped by a wildfire that exploded tenfold in a matter of hours, a crack team of firefighting "Hotshots" broke out their portable emergency shelters and rushed to climb into the foil-lined, heat-resistant bags before the flames swept over them.
By the time the blaze had passed, 19 men lay dead in the nation's biggest loss of firefighters in a wildfire in 80 years.
The tragedy Sunday evening all but wiped out the 20-member Granite Mountain Hotshots, a unit based at Prescott, authorities said Monday as the last of the bodies were retrieved from the mountain in the town of Yarnell. Only one member survived, and that was because he was moving the unit's truck at the time.
The deaths plunged the two small towns into mourning as the wildfire continued to threaten one of them, Yarnell. Arizona's governor called it "as dark a day as I can remember" and ordered flags flown at half-staff. In a heartbreaking sight, a line of white vans carried the bodies to Phoenix for autopsies.
"I know that it is unbearable for many of you, but it also is unbearable for me. I know the pain that everyone is trying to overcome and deal with today," said Gov. Jan Brewer, her voice catching several times as she addressed reporters and residents at Prescott High School in the town of 40,000.
The lightning-sparked fire - which spread to 13 square miles by Monday morning - destroyed about 50 homes and threatened 250 others in and around Yarnell, a town of 700 people in the mountains about 85 miles northwest of Phoenix, the Yavapai County Sheriff's Department said.
About 200 more firefighters joined the battle Monday, bringing the total to 400. Among them were several other Hotshot teams, elite groups of firefighters sent in from around the country to battle the nation's fiercest wildfires.
Residents huddled in shelters and restaurants, watching their homes burn on TV as flames lit up the night sky in the forest above the town.
It was unclear exactly how the firefighters became trapped, and state officials were investigating.
Brewer said the blaze "exploded into a firestorm" that overran the crew.
Brian Klimowski, a National Weather Service meteorologist in Flagstaff, said there was a sudden increase and shift in wind around the time of the tragedy. The blaze grew from 200 acres to about 2,000 in a matter of hours.
Southwest incident team leader Clay Templin said the crew and its commanders were following safety protocols, and it appears the fire's erratic nature simply overwhelmed them.
The Hotshot team had spent recent weeks fighting fires in New Mexico and Prescott before being called to Yarnell, entering the smoky wilderness over the weekend with backpacks, chainsaws and other heavy gear to remove brush and trees as a heat wave across the Southwest sent temperatures into the triple digits.
Arizona Forestry Division spokesman Mike Reichling said all 19 victims had deployed their emergency shelters as they were trained to do.
When there is no way out, firefighters are supposed to step into them, lie face down on the ground and pull the fire-resistant fabric completely over themselves.
"It'll protect you, but only for a short amount of time. If the fire quickly burns over you, you'll probably survive that," said Prescott Fire Capt. Jeff Knotek. But "if it burns intensely for any amount of time while you're in that thing, there's nothing that's going to save you from that."
Autopsies were scheduled to determine exactly how the firefighters died.
President Barack Obama offered his administration's help in investigating the tragedy and predicted it will force government leaders to answer broader questions about how they handle increasingly destructive and deadly wildfires.
"We are heartbroken about what happened," he said while on a visit to Africa.
The U.S. has 110 Hotshot crews, according to the U.S. Forest Service website. They typically have about 20 members each and go through specialized training.