A minor school girl was sexually abused by a large number of youths at Chowkham in Lohit district.
The girl, a student of class IX was allegedly raped by the group on Monday last when she along with her friends went out for a picnic, police said.
According to sources, eight students including five boys went for picnic on the bank of nearby Bereng river.
They enjoyed the sight and stayed in the spot till darkness which drew the attention of a group.
While five youths and two girls managed to flee, a local girl got trapped.
Lohit Superintendent of Police S Kuruvilla visited to spot to investigate the matter and bring the culprits to book.
After conducting medical examination of the girl, a police team under the supervision of the SP launched massive operation to arrest the absconding youths.
The senior members, the youth brigades and village defense parties of local Khampti and the Chakma communities have been extending cooperation to the police to arrest the culprits, who have been identified, the SP said.