An official in Turkey says the country faces a “very risky week” for wildfires as blazes across parts of southeast Europe and the Balkans damaged homes and led to a huge firefighting operation that included evacuations.

Wildfires that have engulfed Turkey for weeks spread rapidly overnight, threatening Bursa and forcing 3,500 to flee. Greece and Bulgaria are also contending with fires.

Wildfires driven by searing temperatures and strong winds ravaged Turkey and parts of Greece in recent days, leaving four people dead and forcing hundreds of residents and tourists to flee the flames.