The firefighters — members of a specially trained unit that is sent into danger ahead of everyone else to size up a wildfire — rushed up a narrow, winding gravel road with steep hills on either side.

It proved to be a death trap.

Their vehicle crashed, and before they could escape, flames rolled over them, killing three firefighters inside and injuring four others nearby, one critically, authorities said.

The tragedy Wednesday night cast a pall in Washington state and brought to 13 the number of firefighters killed across the West this year during one of the driest and most explosive wildfire seasons on record.

The blazes have "burned a big hole in our state's heart," Gov. Jay Inslee lamented Thursday, describing the outbreak as an "unprecedented cataclysm."

"These are three big heroes protecting small towns," the governor said, urging residents to "thank a firefighter."

Fire officials with notebooks and cameras walked the hills and banks near Woods Canyon Road outside Twisp, investigating how the disaster happened. Authorities gave few details, shedding no light, for example, on the crash or its cause, other than to say that it was not the accident itself that killed the victims, but the fire.

The deaths happened in the scenic Methow River valley about 115 miles northeast of Seattle, where a series of blazes covering close to 140 square miles had merged. The flames burned an undetermined number of homes and triggered orders to about 1,300 people in the outdoor-recreation communities of Twisp and Winthrop to evacuate.

"It was a nightmare," Okanogan County Sheriff Frank Rogers said. "Everything was burning." He added: "We know it was a firestorm in there."

All of the dead were U.S. Forest Service firefighters. They were from highly specialized crews who go into dangerous areas as fast as they can to examine a scene and report back to commanders on what needs to be done, said Bill Queen, a firefighting spokesman.

"It just kind of exploded and they got caught in a burn over," said Queen, referring to what happens when conditions change so rapidly that flames overtake firefighters.

Nearly 29,000 firefighters — 3,000 of them in Washington — are battling some 100 large blazes across the drought- and heat-stricken West, including Idaho, Oregon, Montana and California.

Conditions were expected to deteriorate in Washington on Thursday, with high winds and high temperatures.

"We have a responsibility to stay on focus and stay on task today. That's a good way to honor the fallen firefighters," said fire incident commander Chris Schulte.

Jessica Gardetto of the National Interagency Fire Center in Boise, Idaho, said the 13 dead firefighters this season is a high number, but she could not immediately say more specifically how it compared with other years.

Of the injured, two are with the state Department of Natural Resources, one is a department contractor, and one is a U.S. Forest Service employee. The most seriously hurt, a 25-year-old man from Puyallup, had burns over 60 percent of his body.

Rick McCauley, a manager at Sun Mountain Lodge, which sits at the end of an 18-mile road winding through forests from the town of Winthrop, said he had about 70 rooms filled when he decided to evacuate the hotel.

"We looked at the fire coming over the hill and made the decision to clear everyone out," he said. "There's only one road in and out, so we don't want to take any chances."

Steve Morse, who lives near the Twisp fire, said he watched flames "kind of hopscotching these ridges, working toward our house."

"I can't even imagine. To lose your life fighting fire, it's horrible for a family, and it's just a bad deal," he said.

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Associated Press writers Ted Warren in Twisp and Martha Bellisle in Seattle contributed to this report.