A sweltering heatwave that has settled over western Canada for several days is believed to be a contributing factor in dozens of sudden-death calls received by police in the Vancouver area, authorities have said.

Cpl Mike Kalanj, of Burnaby Royal Canadian Mounted Police, said the detachment responded to 25 sudden-death calls in a 24-hour period. The deaths are still under investigation and many of the deceased were elderly, he said.

Temperatures in the Vancouver area reached just under 32C (90F) on Monday, but the humidity made it feel close to 40C (104F) in areas that are not near water, Environment Canada said.

The record-breaking heatwave could ease over parts of British Columbia, Yukon and the Northwest Territories by Wednesday, but any reprieve for the Prairie provinces is further off.

In Vancouver, the police department said it had redeployed dozens of officers and asked the public to call 911 only for emergencies because heat-related deaths had depleted frontline resources and delayed response times.

“Vancouver has never experienced heat like this, and sadly dozens of people are dying because of it,” said Sgt Steve Addison. “Our officers are stretched thin, but we’re still doing everything we can to keep people safe.”

As of mid-afternoon on Tuesday, he said, police had responded to more than 65 sudden deaths since the heatwave began on Friday.

“The vast majority of these cases are related to the heat,” he said, adding that on a typical day, Vancouver police respond to between three and four sudden-death calls.

Ingrid Jarrett, CEO of the British Columbia Hotel Association, said residents in parts of the Lower Mainland, Victoria and the Okanagan region have been booking air-conditioned rooms so they can continue working and also get some sleep.

Environment Canada said the weather system shattered 103 heat records across British Columbia, Alberta, Yukon and the Northwest Territories on Monday.

Those records include a new Canadian high temperature of 47.9C (118F) set in Lytton, British Columbia, smashing the previous record of 46.6C (116F) set in the same village a day earlier.