At least 30 people have been killed after a dam collapsed in Sudan, with the homes of 50,000 residents destroyed, the UN has said.

People are trapped in vehicles in the floodwater, which has hit 20 villages, one local told Al Jazeera.

“There were seven lorries carrying families, elderly and children,” Ali Issa said. “We came to see what had happened but were not able to get to the dam.”

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