484 travellers, including 105 Indians, 93 Nepalis missing :::::: On great Nepal tragedy ::: Several key details remain unknown ::: .... river Trishuli suddenly becoming swollen by enormous amounts of water

Making things worse, several key details remain unknown.  

At least 484 travellers, including 105 Indians, 93 Nepalis, three US citizens, and 12 British citizens, have been reported missing. Eight South Koreans working on a hydropower plant were also unaccounted for.  

The other missing included 17 Malaysian nationals, four South Africans, and one person each from Australia and the Netherlands.

Authorities have not established the exact time the flood began or confirmed what triggered it. The full extent of damage in Syaphrubesi and Timure, among the worst-hit areas, is still unclear. Reports indicate extensive damage to buildings and infrastructure, but there is no confirmed information yet on casualties.

Sanjeev Adhikari, a meteorologist with the Flood Forecasting Division, said the flooding did not appear to have been caused by heavy rainfall in Rasuwa itself. Satellite imagery showed significant rainfall on the Tibetan side of the border.

A flash flood from Tibet has caused widespread damage in Nepal’s Rasuwa district, with security personnel missing and the full extent of the casualties and destruction still unknown.  

Nepal police have given an update that 157 bodies have been recovered from the disaster.

Police said bodies had been recovered in the following areas:

Rasuwa — 3

Nuwakot — 13

Dhading — 27

Chitwan — 64

Gorkha — 19

Tanahun — 9

Nawalparasi East — 22

They also said that 49 injured people were in hospital receiving treatment, and that so far more than 3,300 police officers had been deployed.

 BBC snap 

Officials said work was under way to establish the whereabouts of 579 tourists, including 466 foreigners from 28 different countries. 

Of the tourists unaccounted for so far, 113 are Nepali, 54 from the US and 33 are UK nationals, according to the police.

Chinese state media says three people have died and 265 are missing in Tibet.
The missing tourists include 12 travellers from the UK as well as Americans, Malaysians, South Africans and Indians.  

Alpine Eco Trek, which offers guided tours and expeditions in Nepal, confirmed that 12 British nationals on its tour across the Nepal-Tibet border were missing.

Reuters snap : BBC 

Ram Kumar Adhikari, the manager of Alpine Eco Trek, said two Irish nationals and four South African nationals who were also on the excursion are believed to be missing.  

Verified videos from Nepal show a bridge being swept away and multi-storey buildings collapsed by the force of floodwaters, as well as a town with many buildings destroyed.

BBC Verify has located the clips to the town of Trishuli Bazaar area of Nuwakot District in Bagmati Province, about 25km (16 miles) to the north-west of Kathmandu.

The video shows the river Trishuli suddenly becoming swollen by enormous amounts of water, which appears to have significantly increased in volume and speed and filled with sediment.