LAS VEGAS, N.M. —

       Firefighters slowed the advance of the largest wildfire in the U.S. as heavy winds relented Wednesday, while President Biden approved a disaster declaration that brings new financial resources to remote stretches of New Mexico devastated by fire since early April.

       Rep. Teresa Leger Fernandez (D-N.M.) announced the presidential disaster declaration during an evening briefing by the U.S. Forest Service about efforts to contain the sprawling wildfire in northeastern New Mexico, which has fanned out across 250 square miles of high alpine forest and grasslands at the southern tip of the Rocky Mountains.

       “It will help us do that rebuilding and it will help us with the expenses and the hardship that people are facing right now,” the congresswoman said. “We’re glad it happened this quickly.”

       Firefighters said they were taking advantage of an interlude of relatively calm and cool weather to keep the blaze from pushing any closer to the small New Mexico city of Las Vegas and other villages scattered along the fire’s shifting fronts. Airplanes and helicopters dropped slurries of red fire-retardant from the sky, as ground crews cleared timber and brush to starve the fire along crucial fronts.

       Bulldozers for days have been scraping fire lines on the outskirts of Las Vegas, which has a population of 13,000, while crews have been conducting burns to clear adjacent vegetation. Aircraft dropped more fire-retardant as a second line of defense along a ridge just west of town in preparation for intense winds expected over the weekend.

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       An estimated 15,500 homes in outlying areas and in the valleys of the Sangre de Cristo Mountains that border Las Vegas have been affected by mandatory evacuations. The tally of homes destroyed by the fire stands around 170.

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       Biden’s disaster declaration releases emergency funds for recovery efforts in three counties in northeastern New Mexico where fires still rage, as well as portions of southern New Mexico where wind-driven blazes killed two people and destroyed more than 200 homes in mid-April.

       The aid includes grants for temporary housing and home repairs, low-cost loans to cover uninsured property losses and other relief programs for individuals and businesses, a statement from the White House said.

       Local law-enforcement officials acknowledged the physical and emotion toll of prolonged evacuations. Las Vegas Police Chief Antonio Salazar said his officers would provide “burglary patrols” of evacuated areas and help maintain order at a local Walmart as people line up to purchase supplies.

       Dan Pearson, a fire behavior specialist with the federal government, said weather forecasters were anticipating two days of relatively light winds before the return of strong spring gales.

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       “Our prayers are working because we’ve had advantageous winds throughout the fire area today,” he said. “We’ll take advantage of this fact over the next few days. ... What we can do is build resilient pockets.”

       The fire was contained across just 20% of its perimeter. Its flames Wednesday were about a mile away from Las Vegas, where schools were closed as residents braced for possible evacuation.

       Officials at Los Alamos National Laboratory were warily tracking another wildfire that crept Wednesday within about five miles of facilities at the U.S. national defense laboratory based in Los Alamos, N.M.

       Fire crews worked to widen a road that stands between the fire and Los Alamos while clearing out underbrush and treating the area with fire-retardant.

       Nationally, the National Interagency Fire Center reported Wednesday that a dozen uncontained large fires have burned about 436 square miles in five states.