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.

A fourth person died as wildfires blaze on in Spain and parts of Europe worsened by sweltering heat fueled by effects of climate change. Spain's weather agency, Aemet, warned the public on Monday to be "cautious" of the "very high or extreme fire danger" in most of Spain as it reported high 108 degree Fahrenheit temperates on Sunday in Cadiz in the southern tip of Spain only miles to the Strait of Gibraltar.

Spain's worst wave of wildfires in at least two decades spread to the southern slopes of the Picos de Europa mountain range on Monday and prompted authorities to close part of the popular Camino de Santiago pilgrimage route.

Thousands of firefighters worked overnight to contain dozens of deadly wildfires burning across Spain and Portugal as heat and gusty winds spread blazes through dry brush, forests and crops.

Deadly wildfires ravaging Spain have burnt the equivalent of nearly half a million football fields this year, setting a new record for the country, a

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 heatwave is continuing to affect the Iberian Peninsula. Thousands of firefighters have been deployed to battle ongoing blazes and towns have been evacuated. Spanish Prime Minister Pedro Sánchez visited affected regions to meet with the heads of emergency teams.

A second volunteer firefighter has died after battling a wildfire in the northern Spanish province of Leon, while police arrested a man for allegedly starting a separate blaze as the country faced one of its worst summers for fires in 20 years.