More than 5,000 people isolated by flooding in northwest North Korea were rescued in airlifts and other evacuation work supervised by leader Kim Jong Un, state media reported Monday.

Heavy rainfall on Saturday had caused a river on the North Korean-Chinese border to exceed a dangerous level and created "a grave crisis," the official Korean Central News Agency said.

Firefighters made progress and were aided by improving weather Sunday in the battle against wildfires covering massive areas and leaving a trail of damage in the western United States, but further evacuations and resources have been necessary as thousands of personnel tackle the flames.

The so-called Park Fire, the largest wildfire in California this year, was one of more than 100 blazes burning in the U.S. on Sunday, according to the National Interagency Fire Center. Some were sparked by the weather, with climate change increasing the frequency of lightning strikes as the western U.S. endures blistering heat and bone-dry conditions.