Flooding and landslides triggered by heavy rainfall have killed at least 50 people in Nepal in the past few days, with more deaths reported across the border in India and Bangladesh, officials said onSunday.

At least 30 other people were missing in Nepal, either swept away by swollen rivers or buried by mudslides since monsoon rains began pounding the region on Friday, Nepal's National Emergency Operation Center said.

The center said nine key highways remained blocked by floods and mudslides, and attempts were underway to open them up for traffic. Among them is the East-West Highway, which connects Nepal's southern districts.

Other roads were being cleared by thousands of police and soldiers. Continuing bad weather has grounded helicopter rescue flights. Workers were also repairing fallen communication towers to restore phone lines.

Thirty people have been treated for injuries and more than 1,100 others rescued from flooded areas. More than 10,000 are estimated to have been displaced.