Inclement weather is hampering the massive joint search operation by the Indian and Bhutanese rescue teams to trace the missing helicopter carrying Arunanchal Pradesh Chief Minister Dorjee Khandu and four others.The four-seater single-engine Pawan Hans helicopter went missing after 20 minutes of its take off from Tawang at 9.56 AM yesterday.Our correspondent reports,the massive operation involves thousands of security personnel on the Indian side with 15 teams on Bhutan side,but nothing could be achieved so far due to bad weather .IAF Spokesman Wing Commander Ranjeev Sahoo told AIR, an Mi17 chopper of the Indian Air Force which went looking for the missing helicopter made two sorties before bad weather forced it to return today. He said,the aerial search can resume, only when the weather clears.The Mi17 helicopter from Tawang searched the Bhutan areas besides the Tawang-Itanagar route.Two Cheetah helicopters are on stand-by at Tezpur and another MI 17 at Guwahati, which could not take off because of the bad weather.Two Sukhoi-30 warplanes also scanned the general area using their special radars,but no indication was found.Defence sources said, 30 columns of the Indian Army comprising 2,400 personnel from Tawang and Tenga are searching on the ground for the missing helicopter on the Indo-Bhutan border.More Army columns are likely to join soon. Besides Army, SSB, ITBP and the state police are participating in the joint operation on the Indian territory side. All ITBP teams along the Indo-Bhutanese border side have been pressed in to rescue operation.Two Central Ministers Mukul Wasnik and V Narayanswamy are to to oversee the operations from Itanagar on the directions of the Prime Minister Dr. Manmohan Singh.The President and the Prime minister have expressed concern at the incident of missing chopper.Meanwhile,India's Ambassador to Bhutan, Pawan Verma said that Bhutanese officials are rendering all help in the rescue operation in the Bhutanese territory. Bhutan has launched search operation in its seven districts.External Affairs Minister S M Krishna today spoke to Bhutanese Prime Minister Jigme Thinley and discussed the issue of logistical support to people involved in the search operations.The state government has set up a crisis management cell to monitor the situation under the overall guidance and supervision of Chief Secretary Tabam Bam. The passengers on the chopper included crew members Captain J S Babbar, Captain T S Mamik,Mr. Khandu’s security officer Yeshi Choddak and sister of Tawang MLA Tsewang Dhondup ,Yeshi Lhamu.