Many of the dead were found alone, in homes without air conditioning or fans. Some were elderly — one as old as 97. The body of an immigrant farm laborer was found in an Oregon nursery.

As forecasters warned of a record-breaking heat wave in the Pacific Northwest and western Canada last weekend, officials set up cooling centers, distributed water to the homeless and took other steps. Still, hundreds of people are believed to have died from Friday to Tuesday.

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An excessive heat warning remained in effect for parts of the interior Northwest and western Canada Thursday.

The death toll in Oregon alone was near 80 on Thursday, according to state officials, with most occurring in Multnomah County, which encompasses Portland.

In Canada, British Columbia’s chief coroner, Lisa Lapointe, said her office received reports of at least 486 “sudden and unexpected deaths” between Friday and Wednesday afternoon. Normally, she said about 165 people would die in the province over a five-day period.

She said it was too soon to say with certainty how many deaths were heat related, but that it was likely the heat was behind most of them.

Field laborers work at a farm near Ernst Nursery and Farms, the location of a heat death during last weekend's record breaking temperatures on Thursday, July, 1, 2021, in St. Paul, Ore. Hundreds of deaths in Canada, Oregon and Washington may have been caused by the historic heat wave that baked the Pacific Northwest and shattered all-time temperature records in usually temperate cities.

Field laborers work at a farm near Ernst Nursery and Farms, the location of a heat death during last weekend's record breaking temperatures on Thursday, July, 1, 2021, in St. Paul, Ore. Hundreds of deaths in Canada, Oregon and Washington may have been caused by the historic heat wave that baked the Pacific Northwest and shattered all-time temperature records in usually temperate cities.

Nathan Howard / AP

Washington authorities have linked more than 20 deaths to the heat, but authorities said that number was likely to rise.

In Oregon's Multnomah County, the average victim's age was 67 and the oldest was 97, according to county Health Officer Jennifer Vines.

In a telephone interview Thursday, Vines said she had been worried about fatalities amid the weather forecasts. Authorities tried to prepare as best they could, turning nine air-conditioned county libraries into cooling centers.

Between Friday and Monday, 7,600 people cooled off amid the stacks of books. Others went to three more cooling centers. Nearly 60 teams sought out homeless people, offering water and electrolytes.

“We scoured the county with outreach efforts, with calls to building managers of low-income housing to be checking on their residents,” Vines said.

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But the efforts weren't enough, she said: “It’s been really sobering to see these initial (fatality) numbers come out.”

Oregon Office of Emergency Management Director Andrew Phelps agreed. “Learning of the tragic loss of life as a result of the recent heat wave is heartbreaking. As an emergency manager – and Oregonian – it is devastating that people were unable to access the help they needed during an emergency,” he said.

Among the dead was a farm laborer who collapsed Saturday and was found by fellow workers at a nursery in rural St. Paul, Oregon. The workers had been moving irrigation lines, said Aaron Corvin, spokesman for the state’s worker safety agency, Oregon Occupational Safety and Health, or Oregon OSHA.

Oregon OSHA, whose database listed the death as heat-related, is investigating labor contractor Andres Pablo Lucas and Ernst Nursery and Farms, which did not respond to a request for comment. Pablo Lucas declined to comment Thursday.

In Bend, Oregon, the bodies of two men were found Sunday on a road where dozens of homeless people stay in trailers and tents.

Cooling stations had been set up at the campsite on Saturday, with water, sports drinks and ice available.

Weather experts say the number of heat waves are only likely to rise in the Pacific Northwest, a region normally known for cool, rainy weather, with a few hot, sunny days mixed in, and where many people don't have air conditioning.

“I think the community has to be realistic that we are going to be having this as a more usual occurrence and not a one-off, and that we need to be preparing as a community,” said Dr. Steven Mitchell of Seattle's Harborview Medical Center, which treated an unprecedented number of severe heat-related cases. “We need to be really augmenting our disaster response.”

This week's heat wave was caused by what meteorologists described as a dome of high pressure over the Northwest and worsened by human-caused climate change, which is making such extreme weather events more likely and more intense.

Seattle, Portland and many other cities broke all-time heat records, with temperatures in some places reaching above 115 degrees Fahrenheit (46 Celsius).

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Associated Press journalist Manuel Valdes contributed to this report from Seattle.

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Follow Andrew Selsky on Twitter at https://twitter.com/andrewselsky

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