Federation says it fears death toll of nearly 600 will continue to rise as rescuers reach cut-off areas

• Nepal-Tibet flash flood – latest updates

• Visual guide: how the deadly flooding unfolded

• Tell us: have you been affected by the flash floods?

The Red Cross has said at least 93,000 people may have been affected by Wednesday’s flash floods on the Nepal-Tibet border, which have killed nearly 600 people, left another 1,900 missing, and triggered a huge rescue operation that is being hampered by fears of new flooding.

The International Federation of Red Cross and Red Crescent Societies (IFRC), the world’s largest humanitarian network, said it feared the death toll would continue to rise as some of the hardest-hit areas remained inaccessible after roads and bridges were destroyed by the torrents.

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© Photograph: Rajesh Kumar Singh/AP

© Photograph: Rajesh Kumar Singh/AP

© Photograph: Rajesh Kumar Singh/AP

The scale of the disaster in the Himalayas is becoming clearer a day after catastrophic flooding tore through parts of Nepal and Tibet. Scientists believe the disaster was likely triggered by the collapse of a glacier, unleashing a torrent of water, mud and debris that swept away entire communities. Geoff Bennett discussed more with Dan Shugar of the waterSHED Lab at the University of Calgary.