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Russia rejects UN help as death toll from breached dam rises. Death toll has risen to 52, with Russian officials saying 35 people had died in Moscow-controlled areas. More than 11,000 have been evacuated on both sides. Levels of toxic substances in sea organisms and on the seabed are expected to worsen, augmenting the risk from land mines that are washing up on the shoreline. Water tests last week showed dangerous levels of salmonella and other “infectious agents,” Ukrainian officials said. Monitoring for cholera was also in place.

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