The Kandivali police have booked two teachers at a pre-school for allegedly mistreating, hitting and slapping toddlers in the classrooms. According to the police, the issue came to light when a parent realized sudden aggressive changes in the behaviour of his child. "On the complaint of one parent, on Sunday, we registered the case, and booked two teachers of the pre-school in Kandivli west," said an officer from the Kandivali police station. There are 25 kids at the pre-school.