France has offered three firefighting planes, while Spain has already sent two water-bombing aircraft to help tackle the fires. The European Union has also promised to provide firefighting aircraft.
Dozens of people who fled their homes have been taken in by residents of the nearby municipality of Ansiao.
Pope Francis, who visited Portugal last month, mentioned the victims in his weekly address: «I express my closeness to the beloved people of Portugal following the devastating fire.»
French President Emmanuel Macron tweeted: «Solidarity with Portugal, hit by terrible fires. Our thoughts are with victims. France makes its aid available to Portugal.»
The fires began on Saturday during an intense heatwave and rainless thunderstorms, with temperatures of more than 40C (104F) in some areas. Police say lightning striking a tree may have caused the fire.
«This is a region that has had fires because of its forests, but we cannot remember a tragedy of these proportions,» Valdemar Alves, the mayor of Pedrógão Grande, was quoted as saying by the Associated Press agency.
«I am completely stunned by the number of deaths.»
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