The bus (Ba 1 Kha 9698) of Paragon English Boarding School of Kamal Binayak fell off the road at 9:30am while carrying the students from Sudal.
Seriously injured students Milan Sakha, Nilam Timilsina and Bibek Dahal are undergoing treatment at B and B Hospital, Gwarko.
Police inspector Dipak Dhungel said driver Krishna Prasad Dulal is under police control for further investigation.
Nirajan Dulal, a seventh grader student who met the accident said the bus over turned while trying to save a woman.
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