Nepali authorities have said a dammed lake over the border in Tibet has broken its banks, two days after a flash flood hit the region.

Helicopter rescue operations have now been stopped, according to Reuters, and locals have been witnessed rushing up a hill to reach higher ground.

‘Information has been received that a water dam has burst again on the Tibetan side,’ police said in a statement.

‘All security personnel, rescue workers, and the general public deployed in rescue and relief operations are requested to remain alert and immediately move to a safe location/report the incident.’

Narendra Pariyar, the most senior bureaucrat of the district, said on Friday: ‘We can see that the level of water in the river is rising,’ he said, adding that it is unclear how high the water level is at present.

Earlier this morning, rescue operations in the area were suspended after the lake began to overflow.

Nepali and Chinese authorities had warned of further flooding from the lake that formed upstream after Wednesday’s disaster and was already overflowing.

Rescue efforts after devastating flash floods in Nepal have reached a ‘critical stage’, Chinese officials have said.

33 British nationals are among hundreds of people missing and feared dead as rescue efforts continue after flooding in the Rasuwa district, which borders China’s autonomous region of Tibet.

Rescuers have been urged to remain on high alert after a dam burst its banks again in Nepal, and officials said the high water level of the landslide-dammed lake poses ‘a risk of a further breach’.

China and Nepal have said more than 1,500 people are missing, as Nepalese Police said the death toll in the country had risen to 547.

On Friday, Nepal police spokesperson Abi Narayan Kafle said the search operation had not stopped, but rescuers have been urged to immediately move to a safe location if necessary.

Chinese officials said those downstream of the lake should ‘remain highly vigilant’ and ‘make preparations for prevention and emergency response in advance.’

The Royal Grammar School in Guildford, where missing 18-year-old Brit Spandan Sahu studied before recently completing his A-levels, has released a statement regarding their former student.

Sahu and his 13-year-old sister Syna Kumari Sahu were in Nepal with their parents, Santosh Sahu, 46, and Surabhi Manmath Padhy, 44. They are amongst 33 Brits missing after the flood on Wednesday.

A spokesperson for the school said:

Speaking to AFP, survivors of Wednesday’s flash floods in Nepal recounted their desperate fight for survival as a tsunami swept through the region.

Gorakh Khatka, an engineer who had been in the Shanti Bazar area near the epicentre of the disaster, said: ‘All we got to react was 20 seconds before mud and water was as high as 20 feet (six metres) in the inundated area.’

‘We ran for our lives and spent more than 48 hours on a hill before help finally arrived.’

Sivaranjani Muthunathan was travelling in Nepal by bus with 56 others from India’s southern state of Tamil Nadu.

They were heading towards the Chinese border when they became stuck in what they thought was a traffic jam.

‘Then there was fog, smoke, something that seemed to suddenly engulf us,’ Muthunathan, 46, said.

Vehicles were swept away or buried under mud around them.

‘One by one, we also climbed out through the driver’s side,’ she said, recounting how she had then scrambled up a hill.

Another person added: ‘We had no choice. Every vehicle in front of us, behind us, was gone.’

‘As we were climbing up, we could hear what felt like explosions. They were rocks and boulders crashing.’

Chinese authorities assessed that risks from an overflowing lake formed after a glacier collapse that triggered catastrophic flooding on the China-Nepal border had become manageable by Friday afternoon, allowing suspended rescue operations to resume

Nepal and China both warned on Thursday of fresh risks of ‌flooding in the Himalayas, with a dam from debris leading to the formation of a lake that had been threatening to collapse.

The Red Cross has predicted that at least 93,000 people have been impacted by the floods in Nepal.

David Fisher, the head of the International Federation of Red Cross and Red Crescent Societies (IFRC) delegation to Nepal, said there were ongoing concerns about the risk of further flooding across the country.

‘We are, of course, very concerned about the secondary flood,’ he told reporters.

The IFRC has launched an emergency appeal for £23million to support the humanitarian response to the disaster.

A millionaire family-of-four from Surrey including a former Mrs India UK are among the missing Britons in Nepal following a devastating flash flood this week.

Days on from the initial disaster, rescuers are still scouring the mud and debris left by the flood along the Himalayan border between Nepal and China-controlled Tibet.

Police in Nepal said on Friday morning that the country’s death toll had risen to 469 from 390 a day earlier. China had not updated its report of three deaths in Tibet. More than 1,500 people are missing overall.

Among them are ex-banker and beauty pageant winner Surabhi Sahu, 44, her businessman husband Santosh, 46, their son Spandan, 18, and daughter Syna, 13, who were on an adventure trek across the Nepal-China border.

Mr and Mrs Sahu ran a successful technology company in London together before he set up a thriving pharmaceutical business. The family live in a £1.3million six-bedroom house in Cobham, Surrey.

They travelled to India last week and then on to the Nepalese-Tibetan trek. They were due to return in ten days before the start of the new school year.

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Missing UK millionaire family pictured in Nepal before disaster 

A millionaire family-of-four from Surrey including a former Mrs India UK are among the missing Britons in Nepal following a devastating flash flood this week.