One bus was carrying at least 24 people, while the other had at least 42, but more could have boarded en route, Bhusal said.
The three survivors were being treated in the hospital, Bhusal said, adding that they reportedly jumped out of the bus and swam to the banks, where locals found them and took them to a nearby hospital.
A third bus was hit by another landslide on Friday morning a short distance away on the same highway. Bhusal said the driver was killed but it was not clear if there were any other casualties.
Nepal’s Prime Minister Pushpa Kamal Dahal said he was saddened by the news and expressed concern over recent flooding and landslides. He added that several government agencies were searching for the missing, in a post on the social media platform X.
On Thursday night, a landslide buried a hut and killed a family of seven near the resort town of Pokhara. The family were asleep when the landslide crushed their hut and damaged three more houses nearby.
Monsoon season brings heavy rains to Nepal from June to September, often triggering landslides in the mountainous Himalayan country.