The incident occurred at around 4:30 a.m. while the bus was transporting students and their parents from Sri Rahula Balika Maha Vidyalaya in Malabe.
Twenty-six girl guides from the school and seven parents were en route to a girl guides’ camp in Rantambe when the driver reportedly lost control of the vehicle, causing it to topple into the canal.
The injured students and parents were admitted to the Warakapola Hospital for treatment.
Warakapola Police are conducting further investigations.