Army helicopters ferry survivors from inaccessible areas to a camp at a barracks in Bidur

The three women sat together in the army tent and wept. They cried out for their sons, their husbands, their homes. As flash floods coursed through the Himalayan mountains on Wednesday morning, a monstrous black wave took everything from them.

As a melting glacier high up in the Himalayas between Tibet and Nepal splintered and crashed into the valley below, it set off a deadly cascade of water, mud and debris down the Bhote Koshi River. The impact of the glacier collapse was so strong that experts initially reported it as an earthquake. The Nepali village homes that lined the riverbank and clung to the mountainside stood little chance.

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.

South Asia correspondent Hannah Ellis‑Petersen is on the ground in Bidur, one of the most devastated towns in Nepal, after the deadly flash floods that struck on Wednesday morning. Most homes were completely washed away when a tide of mud, rocks and debris flooded the river valley. Those who survived describe clinging on to buildings and trees as the water rushed over them

Scale of devastation emerges in Nepal as reporters reach disaster area, but Chinese state media focus more on rescue efforts

• Nepal-Tibet flash flood – latest updates

In the days since an enormous glacier in the Himalayas snapped away from a mountaintop and cascaded into the valley below, the true scale of the devastation caused by the flash floods in Nepal and Tibet is still unfolding.

But the picture is emerging far more quickly in Nepal than in China, where strict controls on the flow of information from one of its most sensitive regions are hampering the public’s understanding of events.

Desperate relatives trying to reach loved ones last seen in area where entire villages have been swept away

• Nepal-Tibet flash flood – latest updates

• Visual guide: how the deadly flooding unfolded

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

Families are rushing to Nepal to search for the 33 British nationals who are still missing, as fears mount over the risk of a second wave of flooding in the region.

The catastrophic flash floods that hit Nepal and Tibet on Wednesday, thundering down valleys and sweeping away entire villages, have killed at least 538 people, while more than 1,500 remain missing.

Nepalis and Tibetans must not pay the price – with their lives, livelihoods and money meant for education and health – for global heating caused by wealthy states

• Sunil Acharya is an international climate policy and just transition specialist based in Kathmandu, Nepal

As a Nepali citizen working on international climate policy for more than a decade, it is difficult to look at the harrowing images coming out of the catastrophic flash flood that thundered down valleys in Nepal, sweeping down the Lhende Khola, Bhotekoshi and Trishuli rivers, and not feel angry.

Not just because of the destruction, but because it comes after years of warnings from scientists and civil society that a rapidly warming planet would make disasters more frequent, more intense and harder to predict. This is what the cost of delaying global climate action looks like.

Sunil Acharya is an international climate policy and just transition specialist based in Kathmandu, Nepal

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Risk of fresh flooding had forced rescue teams to withdraw as residents rushed up hills to escape possible river surge

• Nepal-Tibet flash flood – latest updates

• Visual guide: how the deadly flooding unfolded

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

Rescuers searching for survivors of deadly flash floods on the Nepal-Tibet border have resumed their efforts after suspending operations when a debris dam burst its bank on Friday, increasing the risk of fresh flooding.

Residents in Nepal’s Rasuwa district, on the border with Tibet, were seen rushing up hillsides ⁠on Friday to escape a possible surge in the river, ⁠according to witnesses. Fears of another flood came as authorities in Nepal and China said that at least 543 people had been killed in the disaster.

This live blog is now closed

• ‘The flood took everything I have’: survivors grieve for relatives and homes swept away in Nepal

• Visual guide: how the deadly flooding unfolded

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

More now on the Nepali army’s rescue operation to save about 100 people trapped in a tunnel at a hydropower project swamped by Wednesday’s flooding.

“Two helicopters have been dispatched but it is challenging because it is tough to even locate the entry points of the tunnel,” army spokesperson Raja Ram Basnet told AFP.

Relief efforts are also under way to provide the rescued people what they need.

The army is still working to safely evacuate more than 100 people trapped in the same tunnel.