When she complained to the principal and teachers, they also allegedly assaulted the teenager, according to the victim.
Saran police on Friday arrested the school principal, identified as Uday Kumar alias Mukund Singh.
"I had a telephonic conversation with Saran SP Har Kishore Rai on Friday as well as Saturday to take stock of the situation as the crime was of very serious nature", Diwedi said, adding police were awaiting report of the girl's medical examination.
The girl, a ninth-grade student in Bihar state, said in her complaint that she was first raped in December by three schoolmates who took video of the attack, Rai said. The minor girl's horror did not end there as 15 students from the same school also gang-raped her during this period.
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Based on the girl's statement, a case has been registered at the Ekma police station in Chhapra's Parsagarh.
In total, two teachers (including the principal) and 15 students have been booked on the basis of the victim's statement. She then approached the police with a complaint against the principal, teachers and her schoolmates, reported NDTV News. The girl told reporters on Saturday that she could not muster courage to lodge a complaint with the police since her father was in jail for several months. The girl was sent to a local hospital for a medical check-up and police are searching for the other accused.
The girl said she did not report the abuse immediately, "fearing society would ostracize" her, the English-language Hindustan Times newspaper reported. The police have registered a case and have formed special teams to nab the absconding accused. According to government records, 127 minors and women were subjected to rape in the first three months of 2018. She said that firstly a fellow classmate raped her and made a video clip.