Spain has sent 500 more troops to fight raging wildfires, bringing the total deployed to 1,900, as the death toll from the blazes has risen to four. On Sunday, a firefighter died after an accident during firefighting efforts when his truck fell down a steep hill,

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.

The fires in Spain this year have burned 158,000 hectares or 610 square miles, according to the European Union’s European Forest Fire Information System. That is an area roughly as big as metropolitan London.