Nepal police say the death toll from the floods has risen to 95, according to AFP and Reuters.
This is up from the 31 deaths reported by authorities just a few hours ago.
Four hundred and three people are still missing, including 61 Nepalese people and 341 foreign nationals, says the Nepal Tourism Board in its latest update.
It says that 200 of the missing are women and 203 are men.
The foreign nationals are understood to come from 26 different countries.
From India, 133 are missing, while there are 47 missing from the US, and 33 people from the UK.
According to the tourism board, which cited tour operators, most of the passengers were on their way to Mansarovar, near the border of India and Nepal.
The missing tourists include more than 100 from India, 47 from the US, and 33 from the UK, according to Nepal's tourist board.
The area is popular with pilgrims and trekkers.
CCTV from Tibet shows a wall of water and mud hitting buildings at a border crossing - other images from Nepal show people trying to flee as the flood surges.
In Tibet, Chinese President Xi Jinping is offering personal directives - that usually means an incident is very serious, writes our correspondent in Beijing, Laura Bicker.
Nepal's foreign minister says the flood may have been caused by an earthquake triggering an avalanche.
This is the most devastating disaster in Nepal since the 2015 earthquake which killed 9,000 people, reports the BBC's Phanindra Dahal in Kathmandu.
Nepal police have published a list of some of the flood victims receiving treatment in various hospitals.
Details for 29 people are provided, including a baby of just three months old, said to be in a "normal" condition.
Two three-year-olds and teens as young as 12 and 14 are also listed. It is unclear how many have been injured and are in hospital overall.
The list includes injury details, with some patients said to have bruises or scratches "all over the body" and others with head injuries. Several are reported "unable to speak".
Verified videos of the flash floods show two different bridges over the Trishuli river breaking in half after being struck by debris from other bridges swept away further upstream.
BBC Verify has identified one clip as showing Ghatbesi bridge, which is more than 17 miles (27km) to the west and downriver of the videos from Trishuli town we reported on earlier.
The debris, which includes sections of another bridge, smashes into Ghatbesi bridge, splitting it in two before the flood carries it downstream.
