India, Sept. 7 -- A week after catastrophic floods struck Nepal, search and rescue teams are racing to reach isolated communities as the death toll has crossed 1,000 and nearly 4,000 people remain unaccounted for, Oxfam International said.

Rescue efforts face severe access challenges

The major flash flood on August 26 was triggered by a glacier collapse and an ice-rock avalanche that blocked the Lhende Khola, about 20 kilometres north of the Rasuwagadhi checkpoint. More than 50,000 people have been displaced or temporarily moved from their homes, while damaged roads, bridges and landslides continue to hinder relief operations, particularly in Rasuwa.

The Nepalese government estimates that around 50,000 people urgently need clean water, s...