Wearing jeans and T shirt, the body of the 14-year-old girl was found propped against the wall of a building, Officer in charge of Itanagar Police Station M Bui said.
The deceased was identified as Mukum Dolo, a student of class eight of Government Higher Secondary School at Seijosa in East Kameng district. She was at Itanagar with her parents on summer vacation.
The reason of the death was not immediately known as there was no cut marks or any other injuries in her body, the OC said adding, the exact reason of the death could be ascertained only after conducting postmortem.
A case has been registered and investigation is on, the OC added.