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Preliminary investigations by scientists have pointed to a collapsed glacier as the cause, highlighting the issue of rapidly melting Himalayan ice.
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Hundreds have died in flooding and landslides on the border of Nepal and Tibet.
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He was jailed for life in 2017 for genocide, war crimes and crimes against humanity during the wars in the ex-Yugoslavia in 1992-95.
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The 89-year-old's condition is described as "extremely serious" and members of his family have visited him in hospital.
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Nickolay Mladenov warns that a collapse of last October's ceasefire would be "a point of no return" for the region.