The incident took place at Bonkishore Government Primary School at Faridpur village in Charghat upazila on Friday.

Two outsiders -- Zahrool and Bidhan Chandra -- called Rehana Khatun, 12, a student of class five, to a teacher's room during recess at noon and threw acid on her. She was immediately taken to the local health complex with burn injuries.

Victim's father Shamsul Islam filed a case accusing three persons including a schoolteacher. Police arrested Bidhan.