Wind-driven wildfires that were among South Korea’s worst ever were ravaging the country’s southern regions, killing 24 people, destroying more than 200 structures and forcing 27,000 people to evacuate, officials said Wednesday.

The death toll included a pilot who died after a helicopter crashed during efforts to contain wildfires in the southeastern town of Uiseong, one of the areas hardest-hit. The aircraft had no other crew members.