The World Health Organisation said Sunday that over 1,300 excess deaths had been recorded in Europe since June 21 in connection with the record-breaking heatwave roasting much of the continent.

Tens of millions have been braving a weekend of extreme temperatures in Europe as a deadly heatwave moves eastwards, with some countries announcing rising death tolls and health services warning of saturation.

On Sunday morning, French health officials said there had been around 1,000 more deaths than expected in that country just since Wednesday.

And across Europe, "more than 1,300 excess deaths have been recorded since 21 June linked to high temperatures in Europe", WHO chief Tedros Adhanom Ghebreyesus said on X.

"Heat stress is often called the 'silent killer' – and European homes, workplaces and schools were not built for these temperatures," he said.