Portugal has declared a day of national mourning to mark the deaths of seven who died in wildfires that have burned through the country's west coast.

More than 100 wildfires are stretching thousands of firefighters to the limit in northern Portugal. The country’s worst spate of fires in recent years is blamed for seven deaths since they spread out of control over the weekend.

Three Portuguese firefighters died on Tuesday in one of dozens of forest blazes ravaging the country's central and northern regions, bringing the death toll from the latest wildfires to seven people since Saturday,