A hydroelectric dam has collapsed in southern Brazil after days of heavy rain that triggered massive flooding, killing more than 30 people.

Another 60 people are missing in Rio Grande do Sul state, officials said.

About 15,000 residents have fled their homes since Saturday. At least 500,000 people are without power and clean water across the state.

The extreme weather has been caused by a rare combination of hotter than average temperatures, high humidity and strong winds.

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