Dozens of British nationals are missing in Nepal following flash floods, according to local officials.

The Nepal Prime Minister’s Office said on Wednesday that at least 95 people were dead after flash floods in the Rasuwa region of Nepal which borders China’s autonomous region of Tibet.

In an update on Wednesday evening, Nepal police said 157 bodies had been recovered and more than 40 people were injured and receiving treatment in hospital.

The Nepal Tourist Board said the number of missing people had risen from 384 to 403, with 33 UK citizens among 341 foreign nationals unaccounted for.

According to the tourist board, 203 of the missing are male and 200 female.

Sunil Sharma, a tourism board spokesman, said 133 of those missing were from India on pilgrimage to Mount Kailash in Tibet – a sacred site for Hindus.

Also among the missing were 47 people from the US, 34 from Australia, and 24 from Canada, he added.

Prime Minister Andy Burnham said the Government will do “everything we can” to support British nationals in Nepal following the floods.

In a statement, Mr Burnham said: “These scenes emerging from along the Nepal-China border are devastating.

“My thoughts are with all those affected, including the families and loved ones of British nationals missing in this tragedy.

“We will do everything we can to support British nationals impacted in the region and are in touch with the relevant authorities to offer support.

“I urge British nationals in the region to follow guidance from the local authorities and follow our travel advice.”

Earlier on Wednesday, tour operator Alpine Eco Trek said a 13-year-old girl was among the missing British nationals, as well as two Irish citizens.

Among the missing British nationals are three men aged 65, 64, and 52, and seven women aged 44, 47, 51, 60, 63, 63, and 65, according to travel logs obtained by the Press Association.

The firm, which offers guided tours and expeditions in Nepal, confirmed four of its Nepalese tour guides – aged 38, 35, 45 and 29 – are missing as well.

Kumar Adhikari, the manager of Alpine Eco Trek, told the Press Association on Wednesday: “I feel so sad. We are just thinking about what to do next.

“We are in pain at the moment, deep pain.”

Mr Adhikari said the tour group, who were on a nine-day tour to Mount Kailash, were crossing into Tibet from Nepal when they became trapped at the border as the flash floods struck.

He said he was in contact with his tour guides until 8.40am when their phones went offline, at which point the group would have been inside Tibet’s immigration office.

“We were hoping that inside it was safe,” he said. “But later the video came from China’s government which (showed) even Tibet’s side was hit by the flood.”

The manager said he was fielding “thousands” of missed calls from families back in the UK which he has been “slowly responding to” but has been unable to give them any updates yet.

He also said he had been in contact with the British consulate and forwarded them copies of their British clients’ passports.

The United States Geological Survey (USGS) said a magnitude 5.2 seismic event occurred near the border between Nepal and China on Wednesday at 8:37am local time.

It said the seismic event was a “glacial collapse and debris flow” that caused “subsequent catastrophic impacts downstream”.

In an analysis, the USGS said: “This event was initially reported as a magnitude 4.4 earthquake.

“Additional analysis of nearby seismic stations, long period seismic waves, and satellite imagery led to the determination that the seismic event was instead a glacial collapse and debris flow, and that no earthquake had occurred.”

Foreign Secretary Ed Miliband said: “I am deeply concerned to hear of the flash floods on the Nepal-China border.

“All my thoughts are with those affected and with British nationals in the area and their relatives here at home.”

Baroness Winterton, parliamentary under-secretary of state for Indo-Pacific, said it was “heartbreaking to see the loss and damage caused by the Rasuwa flood in Nepal”.

The Labour life peer added: “Sending our thoughts to all those affected by the disaster.

“We are working closely with the Nepalese authorities following concerning reports of British nationals who are missing.

“We encourage British nationals in Nepal to follow guidance from the local authorities and remain alert to the changing situation.”

The Foreign, Commonwealth and Development Office said it was “deeply saddened by the loss of life and devastation caused by the floods in Nepal”.

It added: “British nationals in Nepal should follow local authority advice and exercise caution while travelling.

“For consular assistance call (+44) (0)207 008 5000 or (+977) (0)14237100.”

The Nepal Tourism Board said its staff and tourist police are “working to verify the whereabouts and safety status of tourists and travellers who were in or travelling through the affected areas”.