Firefighters in Spain, Portugal and Greece battled ongoing wildfires Friday, an important religious holiday in all three countries, as persistent hot, dry conditions challenged efforts to contain the blazes.

A heatwave with temperatures exceeding 40 degrees Celsius, or 104 Fahrenheit, on several days this month was expected to last through Monday.

A second volunteer firefighter who suffered severe burns while battling a wildfire in Spain's northern Leon province has died from his injuries, a government official said on Thursday, as several blazes continued across the country.