In the North-West of North America, record temperatures were recorded recently.
The deaths of more than 100 people in the Pacific Northwest of North America may have been caused by overheating of the body, said representatives of the US states of Oregon and Washington and the Canadian province of British Columbia.
This week, the region experienced a record heatwave.
Authorities in Oregon reported that at least 63 people died in the state due to high temperatures, 45 of them in Multnomah County.
A representative of the health service of the district, which includes the largest city in the state, Portland, said that in 2017-2019, only 12 deaths from hyperthermia were registered in Multnomah.
Since Friday, the thermometer has been rising to 46 degrees in Portland and Seattle.
Police in Vancouver, Canada, said they were responding to at least 65 sudden deaths since Friday.
Authorities across the region have warned that the death toll from overheating could rise as the causes of death are determined.