A helicopter of state-run Pawan Hans that went missing with three persons on board today after taking off from Dibrugarh for Khonsa district in Arunachal Pradesh has been found. A officer said that the helicopter was seen in the dense forests of Tirap district and a rescue operation is currently underway. According to the sources-The Dauphin N3 helicopter lost touch with the Air Traffic Control after taking off at around 11 AM.