Wildfires that have engulfed Turkey for weeks threatened the country’s fourth-largest city early Sunday, causing more than 1,700 people to flee their homes and leaving a firefighter dead.

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.

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 in