By PAUL WISEMAN

WASHINGTON (AP) — The number of people seeking unemployment benefits fell last week for a fourth straight time to a pandemic low, the latest sign that America’s job market is rebounding from the pandemic recession as employers boost hiring to meet a surge in consumer demand.

The Labor Department reported Thursday that jobless claims fell by 29,000 to 348,000. The four-week average of claims, which smooths out week-to-week volatility, also fell — by 19,000, to just below 378,000, also a pandemic low.

The weekly pace of applications for unemployment aid has fallen more or less steadily since topping 900,000 in early January. The dwindling number of first-time jobless claims has coincided with the widespread administering of vaccines, which has led businesses to reopen or expand their hours and drawn consumers back to shops, restaurants, airports and entertainment venues.

Still, the number of applications remains high by historic standards: Before the pandemic tore through the economy in March 2020, the weekly pace amounted to around 220,000 a week. And now there is growing concern that the highly contagious delta variant could disrupt the economy’s recovery from last year’s brief but intense recession. Some economists have already begun to mark down their estimates for growth this quarter as some measures of economic activity, like air travel, have started to weaken.

Filings for unemployment benefits have traditionally been seen as a real-time measure of the job market’s health. But their reliability has deteriorated during the pandemic. In many states, the weekly figures have been inflated by fraud and by multiple filings from unemployed Americans as they navigate bureaucratic hurdles to try to obtain benefits. Those complications help explain why the pace of applications remains comparatively high.

By all accounts, the job market has been rebounding with vigor since the pandemic paralyzed economic activity last year and employers slashed more than 22 million jobs. The United States has since recovered 16.7 million jobs. And employers have added a rising number of jobs for three straight months, including a robust 943,000 in July. In the meantime, employers have posted a record 10.1 million openings, and many complain that they can’t find enough applicants to fill their open positions.

Last week’s drop in applications for aid was larger than many economists had expected, a sign that the job market’s recovery remains on track for now despite the worries surrounding the spread of the delta variant.

“As life normalizes and the service sector continues to gain momentum (delta variant permitting), we expect initial jobless claims to remain in a downtrend,” Joshua Shapiro, chief U.S. economist at the consulting firm Maria Fiorini Ramirez, said in a research note.

Shapiro added that “this report points to a continued rapid pace of job gains since the July employment data were collected.″

Some employers ascribe their labor shortages to supplemental unemployment benefits from the federal government — including $300 a week on top of regular state aid — for discouraging some of the jobless from seeking work. In response, many states have withdrawn from the federal programs, which expire nationwide next month anyway.

Economists point to other factors, too, that have kept some people on the sidelines of the job market. They include difficulty finding or affording child care, fear about becoming infected by the virus at work and the desire of some people to seek better jobs than they had before the pandemic triggered widespread layoffs.

Whatever the causes, the economy remains 5.7 million jobs shy of the number it had in February 2020. And with the U.S. recording an average of more than 100,000 new COVID-19 cases a day — up from fewer than 12,000 in late June — the delta variant is increasingly clouding the outlook for the rest of the year.

Just over 2.8 million people were receiving traditional state jobless benefits in the week of Aug. 7, down by 79,000 from the previous week and the lowest since the pandemic struck.

Including federal benefits, 11.7 million were receiving some type of unemployment benefits in the week of July 31, down from 28.7 million a year earlier. That drop is a result, in part, of the increased number of people working and no longer receiving jobless aid. But it also reflects the cancellation in many states of a federal unemployment aid program for the self-employed and a separate program for the long-term jobless.

By TERENCE CHEA, ETHAN SWOPE and JOHN ANTCZAK

GRIZZLY FLATS, Calif. (AP) — A wildfire raged through a small Northern California forest town Tuesday, burning dozens of homes as dangerously dry and windy weather also continued to fuel other massive blazes and prompted the nation’s largest utility to begin shutting off power to 51,000 customers.

The Caldor fire in the northern Sierra Nevada had burned an estimated 50 homes in and around Grizzly Flats, a town of about 1,200 people, fire officials said at a community meeting.

Gov. Gavin Newsom proclaimed a state of emergency for El Dorado County because of the blaze, which tripled in size between Monday and Tuesday afternoon to nearly 50 square miles (129 square kilometers),

To the north the Dixie Fire — the largest of some 100 active wildfires in more than a dozen Western states — was advancing toward Susanville, population about 18,000.

Meanwhile, Pacific Gas & Electric announced it had begun shutting off power to some 51,000 customers in small portions of 18 northern counties to prevent winds from knocking down or fouling power lines and sparking new blazes.

The utility said the precautionary shutoffs were focused in the Sierra Nevada foothills, the North Coast, the North Valley and the North Bay mountains and could last into Wednesday afternoon.

Very few homes were left standing in Grizzly Flats, where streets were littered with downed power lines and poles. Houses were reduced to smoldering ash and twisted metal with only chimneys rising above the ruins. A post office and elementary school were also destroyed.

Two people with serious or severe injuries were airlifted to hospitals from the Grizzly Flats area, fire officials said.

Derek Shaves and Tracy Jackson were helping their friend salvage food and other supplies from the Grizzly Pub & Grub, a business in the evacuation zone that wasn’t touched by the blaze.

Shaves said he visited Grizzly Flats Tuesday and saw his home and most of the houses in his neighborhood had been destroyed by the fire.

“It’s a pile of ash,” he said. “Everybody on my block is a pile of ash and every block that I visited — but for five separate homes that were safe — was totally devastated.”

At the Dixie Fire, numerous resources were put into the Susanville area, where residents were warned to be ready to evacuate, said Mark Brunton, an operations section chief.

“It’s not out of play, and the next 24 hours are going to be crucial to watch as to what the fire is going to do there,” he told an online briefing.

To the east, spot fires became established south of the small community of Janesville, which had been ordered evacuated. Some structures were lost there — images captured by The Associated Press showed a home consumed by flames — but a surge of firefighters was able to herd the fire around the majority of the town, Brunton said.

The Dixie Fire, which had burned some 600 homes, is the largest of the major wildfires burning in Western U.S. states that have seen historic drought and weeks of high temperatures and dry weather that have left trees, brush and grasslands as flammable as tinder. Climate change has made the U.S. West warmer and drier in the past 30 years and will continue to make the weather more extreme and wildfires more destructive, according to scientists.

Susanville is the seat of Lassen County and the largest city that the Dixie Fire, named for the road where it started, has approached since it broke out last month. The former Sierra Nevada logging and mining town has two state prisons, a nearby federal lockup and a casino.

Ash fell from the advancing fire, and a police statement urged residents “to be alert and be ready to evacuate” if the fire threatens the city.

The Dixie Fire has scorched more than 940 square miles (2,434 square kilometers) in the northern Sierra Nevada and southern Cascades since it ignited on July 13 and eventually merged with a smaller blaze. It’s less than a third contained.

Investigations are continuing, but PG&E has notified utility regulators that the Dixie and Fly fires may have been caused by trees falling into its power lines. The Dixie Fire began near the town of Paradise, which was devastated by a 2018 wildfire ignited by PG&E equipment during strong winds. Eighty-five people died.

Ongoing damage surveys have counted more than 1,100 buildings destroyed, including 630 homes, and more than 16,000 structures remained threatened. Numerous evacuation orders were in effect.

Near the Caldor Fire, people were offering assistance to evacuees, including the four-footed kind. Susan Collins of Placerville used her horse trailer to help move two horses Tuesday after offering help on an El Dorado County Facebook page.

“I know not everybody is prepared when something like this happens, and my purpose in life is to be there to help people,” she said.

Across the state line in Nevada, school administrators delayed start times in the Reno-Sparks because of a cloak of wildfire smoke from the Dixie Fire blanketing the region. Smoke plumes from the Caldor Fire were also visible from northern Nevada.

Two dozen fires were burning in Montana and nearly 50 more in Idaho, Washington and Oregon, according to the National Fire Interagency Center.

In Montana, authorities ordered evacuations on Tuesday for several remote communities in north- central Montana as strong winds propelled a large wildfire toward inhabited areas.

The mandatory evacuation covered Lodge Pole, a town of about 300 people on the Fort Belknap Indian Reservation, and the former mining town of Zortman, which has about two dozen people, KOJM reported.

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John Antczak reported from Los Angeles. Associated Press writers Olga R. Rodriguez in San Francisco, Amy Taxin in Orange County, Samuel Metz in Carson City, Nevada, and Matthew Brown in Billings, Montana, contributed to this report.