More than 100 wildfires stretched thousands of firefighters to the limit in northern Portugal on Wednesday, in the worst spate of fires in recent years.

Deadly wildfires raging in northern Portugal have released record emissions, according to the Copernicus Atmosphere Monitoring Service (CAMS). Storm Boris, which has been pummelling Europe for the last week, has now reached northern Italy.

Data from the European Forest Fire Information Service showed that large-scale blazes had burned an area of more than 105,000 hectares (405 square miles) since Saturday, making this year's total of some 140,000 ha the widest burned area since 2017, when Portugal suffered two devastating waves of wildfires that killed more than 100 people.

More than 100 wildfires stretched thousands of firefighters to the limit in northern Portugal on Wednesday, with seven deaths since the worst spate of fires in recent years spread out of control over the weekend.

At least seven people have died after wildfires in the Aveiro and Viseu areas of Portugal, although cooler weather has helped tackle the flames. Dozens of homes have been destroyed and tens of thousands of hectares of forest and scrubland have been lost to the flames.

Portugal has brought under control the remaining forest fires it battled this week in the north of the country, rescuers said on Friday.More than 120,000 hectares across Portugal had been burnt by wildfires since the start of the year,

Portugal's firefighters have mastered most of the deadly forest fires in the north of the country, according to official data Thursday.