More than 30,000 personnel, including firefighters from across the United States and nearly 140 from Australia and New Zealand, are battling the blazes.
Europe's biggest wildfire this year forced nearly 300 people to leave their homes but nobody died.
The fire, which was 5% contained, was being fuelled by dry brush covering steep terrain and stoked by erratic wind gusts during the night.
Wildfires blazed along a smouldering stretch of Portugal's Algarve Thursday, as hundreds of firefighters battled to control flames that have menaced the popular tourist region for a week.
Firefighters are gaining momentum as they battle several wildfires that have destroyed dozens of homes and forced the evacuation of thousands of residents in California.
Firefighters in Northern California have made progress on a stubborn blaze west of Sacramento, allowing some residents to return to their homes after they were evacuated.
The fire brigade said "around 100 firefighters are tackling a large fire at a hotel of 12 floors in Knightsbridge", a luxury area of central London where Harrods department store is located.
Seven people -- five of them firefighters -- died in a fire that broke out late Saturday in an electronics factory in northern Taiwan, the local fire department said.
Flames and toxic smoke swept through the Sejong Hospital in the southern city of Miryang on Friday, injuring more than 150 people.