Firefighters in Spain, Portugal and Greece battled ongoing wildfires Friday, an important religious holiday in all three countries, as persistent hot, dry conditions challenged efforts to contain the blazes.

Spain on Thursday mourned its third wildfire death this week and Greece began beating back a blaze threatening its third-largest city as an unrelenting heatwave stoked tinderbox conditions in southern Europe.

Fire crews in Greece, Spain and Portugal are racing to contain wildfires, taking advantage of calmer winds that slowed the blazes’ advance. Much of southern Europe, however, remains at high risk under hot, dry conditions on Thursday.