Inspector General of Police (Law and Order) Nabin Payeng said the debris of the chopper was sighted from a hill top at Chopo Yoha in the district by a police team at the confluence of a water fall and the Nyorch river.
The CM announced ex gratia of Rs 4 lakh each to the next of kins of those killed.
Congress retained absolute majority power in Arunachal Pradesh, known as its safest haven by securing 42 seats in the 60-member house and leading in one seat till last report poured in.
Among the major winners include Chief Minister Pema Khandu (Mukto seat in Tawang district, bordering China), his third victory in a row.
The crash of the Mi-17 V5 took place at around 6 am when it was on a maintenance mission.
Facing a rout in other parts of the country, Congress retained power securing three-fourth majority in the Arunachal Pradesh Assembly snapping up 40 of the 60 seats and leading in two.