SEOUL, South Korea — The most destructive wildfires ever to hit South Korea were almost contained, authorities announced Friday, after rain and cooler temperatures helped fire crew put out the blazes that have killed 28 people and razed vast swaths of land since last week.

Rain and cooler temperatures are helping South Korean fire crews as they battle the country’s worst-ever wildfires on Friday, as the governor of the hardest-hit region called for overhauling response strategies to respond to the climate crisis that he says worsened the disaster.