A Pawan Hans chopper carrying Arunachal Pradesh Chief Minister Dorjee Khandu is reported missing while flying from Tawang to Itanagar. Massive search operation has been launched. Two defence IAF choppers have been despatched for search and rescue operations.Two passengers and two crew members were on board the missing chopper. It departed from Tawang at 10 am and was scheduled to land in Itanagar at 11.30 am.Defence sources in Shillong said the helicopter was last sighted at Sela Pass, 20 minutes after taking off from Tawang.Details are awaited.