A firefighter was killed when his truck overturned in northwestern Spain, authorities said Monday, raising the death toll from more than a week

According to the European Forest Fire Information System of the European Union, the fires in Spain this year has burned 158,000 hectares (390,000 acres). That's around the size of metropolitan London.

Thousands of firefighters backed by the military and water-bombing aircraft on Monday battled dozens of wildfires across Spain and Portugal, as the death toll increased to six since the outbreaks began.