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.

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• ‘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.