The death toll from Wednesday's flash flood on the Nepal-Tibet border has passed 500, up from the 469 reported earlier, with more than a thousand people still missing, according to France 24.

Nepali soldiers have pulled around 100 survivors from a flooded hydropower tunnel where they had been trapped since the flood struck, France 24 reported. A separate dispatch put the number still missing at more than 1,500, higher than the other figure — a gap that shows how unsettled the count remains as crews reach valleys cut off since Wednesday.

Rescue efforts were briefly suspended over fears that an overflowing landslide lake could unleash a fresh flood, then resumed under high alert, France 24 said. Satellite imagery reviewed by the broadcaster shows a new lake has formed in the same spot where a glacier collapse triggered Wednesday's disaster, according to France 24.

What to watch: whether the newly spotted lake bursts before crews finish clearing the hydropower tunnel and other cut-off sites, and whether Nepali and Chinese authorities settle on a single, reliable missing-persons count.