Hundreds of firefighters are continuing to battle flames in central Portugal on Sunday from a forest fire that broke out a day earlier and has claimed the lives of at least 61 people.

“At least four other significant wildfires affected different areas of the country on Sunday,” the Associated Press writes, “but the one in Pedrogao Grande,” a forested area about 120 miles (200 km) northeast of Lisbon, “was responsible for all the deaths.”

Scores of people were also injured.

Prime Minister Antonio Costa called it “the biggest tragedy of human life that we have known in years.” He also warned Sunday that the death toll would likely rise.

Some of the victims died in their cars as they attempted to flee the flames, news agencies report.

“This is a region that has had fires because of its forests, but we cannot remember a tragedy of these proportions,” said Valdemar Alves, the mayor of Pedrogao Grande. “I am completely stunned by the number of deaths,” he said

Officials say lightning was the cause.

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