Two firefighters have died in a blaze in Portugal and four in Spain as the Iberian peninsula is gripped by a heatwave.

Authorities said the two firefighters died in a road accident, raising the death toll to two in Portugal and four in Spain since the fires broke out in recent weeks. In Spain, heatwave alerts are now in their third week and emergency services, backed by special army units, are battling fires in the northwest and west of the country.