The fires have spread over the regions of Extremadura, Galicia, and Castile and Leon, forcing authorities to suspend rail services and cut access to roads in the area, as well as blocking a 50-kilometre stretch of the popular Camino de Santiago pilgrimage trail.

Spain's worst wave of wildfires on record spread to the southern slopes of the Picos de Europa mountains on Monday and prompted authorities to close part of the popular Camino de Santiago pilgrimage route.

Spain's weather agency warned the public on Monday to be "cautious" of the "very high or extreme fire danger."

This year is turning into one of the worst fire seasons in recent memory in Europe. Firefighters are struggling to contain out-of-control wildfires in western Spain and Portugal.

A 85-year-old man has died in Spain after the country saw the start of the second official heat wave of the year, authorities said on Monday, as temperatures continue to soar. The man died in Badajoz,

Spain on Friday warned of "very high or extreme fire danger in most of the country," as firefighters there continue battling 14 blazes in temperatures up to 104 degrees Fahrenheit.

Europe’s next heat wave is already building over the Iberian peninsula, potentially testing more temperature records after an unseasonably cool start to August.

Defence minister attributes fires to climate change, heat wave. The Interior ministry said 27 people have been arrested and 92 were under investigation for suspected arson since June.