The death toll from South Africa’s “unprecedented” floods climbed to 341 on Thursday as helicopters fanned out across the southeastern city of Durban in an increasingly desperate search for survivors.

With roads and bridges washed away by rainfall this week, rescuers battled to deliver supplies across the city where some residents have been without power or water since Monday.

“The level of devastation of human life, infrastructure, and service delivery network in the province is unprecedented,” said Sihle Zikalala, premier of KwaZulu-Natal.

“A total number of 40,723 people have been affected. Sadly, 341 fatalities have been recorded,” he told a news conference.

Africa’s southeastern coast is on the front line of sea-borne weather systems that scientists believe are worsening because of global warming. They expect the situation to get far worse in the decades to come.

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