Angry protesters attacked the local Pawan Hans office, breaking window panes and ransacking furniture after reports that the missing chopper carrying Arunachal Pradesh Chief Minister Dorjee Khandu had crashed.
A group of youths ransacked the local Pawan Hans office in Maharlagun, 14 kms from Itanagar, police said.
The glass panes of the director's chamber and booking counter were damaged in the attack, they said.
However, no one was injured, police said, adding the employees fled from the office after the protesters swooped on the building.
The single engine four-seater Pawan Hans helicopter with Khandu and four others on board went missing soon after taking off from Tawang on Saturday.
A pall of gloom descended on the state capital with thousands thronging Khandu's official bungalow at Niti Vihar here. Ministers, MLAs and senior officials were hesitant to talk.
"Never before has Arunachal witnessed such massive development as was undertaken under Khandu after he took over the reins on April 9, 2007," Power Minister Jarbom Gamlin who is also state government spokesman said.