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The firefighters were killed and two sustained burn injuries when they were overcome Saturday by flames from fast-moving fires. They deployed emergency protective shelters during the so-called burnover — which occurs when a fire spreads and closes off all escape routes — in Mesa County, the U.S. Interior Department said.

They worked for the U.S. Wildland Fire Service and U.S. Forest Service and were part of an interagency response to the Knowles and Gore fires, which merged with other fires to form the Snyder Fire. So far, about 44 square miles (114 square kilometers) have burned.

The Wildland Fire Service, created earlier this year to streamline firefighting on public lands, said in a statement that it “stands united” with the Forest Service in grief and “in our unwavering support for the loved ones left behind.”

The names of the firefighters were withheld pending notification to their loved ones, the Interior Department said.

Temperatures in Grand Junction — east of the fire — hit a high of 93 degrees Fahrenheit (34 degrees Celsius) Saturday, with winds gusting to 44 mph (71 kph), according to the ��ɫtv Weather Service.

The Mesa County Sheriff's Office asked people to evacuate the potential path of the fire and to turn on irrigation water to saturate the land. The federal Bureau of Land Management on Saturday closed public access to lands it manages nearby.

On Sunday, strong winds pushed waves of thick, gray smoke from the fire as it burned through a desolate stretch of scrub and red mesa.

Hot, dry and windy conditions

Consecutive days of hot, dry and windy weather fueled fires in Colorado, Utah, Arizona and elsewhere. New fires popped up across the region.

The largest blaze, the , burned out of control in rugged terrain in southwest Utah. It ballooned Sunday to more than 146 square miles (378 square kilometers) after marching through canyons and mountainsides, destroying part of a ski resort. The cause is under investigation.

Firefighters worked on multiple fronts, using bulldozers to scrape away brush and trees to starve the fire of fuel.

No estimates of damage were immediately available. Gov. Spencer Cox in a post on social media thanked crews for what he called “several miraculous stops and saves.”

The danger is even higher this year because of Utah's record-low snowpack and its warmest winter on record. Much of the West is grappling with similar conditions, according to . Some 12 fires were burning in Utah. None were contained by late afternoon Sunday.

Fires across the U.S. burn thousands of square miles this year

��ɫtvly, nearly 4,688 square miles (12,142 square kilometers) have burned since Jan. 1. That is more than the 10-year average.

Fully or largely uncontained wildfires burned across the desert Southwest on Sunday, according to Forest Service data, including in Nevada and Arizona. Their area totaled nearly 469 square miles (1,214 square kilometers).

Emergencies declared in Utah and Colorado

Citing fire conditions, Cox declared an emergency last week and banned fireworks ahead of the July Fourth holiday. State officials said Utah has seen an increase in wildfire starts, with each fire showing unprecedented behavior and stretching wildland firefighting capabilities.

Colorado Gov. Jared Polis also declared an emergency on Saturday, authorizing the use of the ��ɫtv Guard to tackle the fires.

South of Grand Canyon ��ɫtv Park, authorities said a new wildfire was moving away from Grand Canyon Village on Saturday. But about 50 miles (80 kilometers) away, another fire prompted Coconino County officials to issue evacuation orders for those near Kendrick Mountain.

Parts of northern Arizona were without power Saturday as the utility serving the area initiated a safety shut-off in hopes of lessening the wildfire risk. On Sunday, officials said power had been restored to much of Grand Canyon ��ɫtv Park.

Power shutoffs have become more common in the West as wildfire risk has expanded. It is usually a last resort after utility forecasters weigh factors like sustained wind and gust speeds, available fuels and topography.

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Smyth contributed from Columbus, Ohio. Sisak reported from New York. Associated Press writer Michael R. Blood in Los Angeles contributed.