An offence has been registered against a private school's teacher for allegedly caning a Class 10 student and fracturing his hand in Thane, police said.

"Based on a complaint lodged by the 15-year-old student's parents, the police on Saturday registered a case under section 325 (voluntarily causing grievous hurt) of the Indian Penal Code," senior inspector Raju Vanjari of Kalyan taluka police station said.