"Some of the worst I've ever seen by the sheer size of the fires," Joe Meyer, an advanced fire training specialist with the Minnesota Department of Natural Resources, recalled to WCCO. "Just to see the walls of fire that were 100 feet over the treetops and a mile long and tearing through the forest up there.

Firefighters in Spain have been battling wildfires in the north-western province of Leon. Three people have died in Spain due to the blazes this summer. The country is among several European countries experiencing scorching temperatures this week that fuel wildfires and which scientists say human-induced climate change is intensifying.

A volunteer firefighter died from severe burns and several people were hospitalised in dozens of wildfires that raged across Spain, fuelled by strong winds and scorching heat.