Kathmandu, May 23 -- The Nepalese authorities are investigating the activities of a climbing group of former military officers and a minister of the United Kingdom, who climbed Mount Everest in record time and used xenon without informing the authorities about such doping, head of Nepal tourism authority Narayan Prasad Regmi has said.

On Wednesday, UK Minister for Veterans and People at the Ministry of Defense Alistair Carns and a group of former UK Special Forces soldiers hung a British flag on the peak of Mount Everest. With traditional acclimatization methods, it usually takes about two months to climb the mountain. Carns and his team used xenon to ease acclimatization and reached the peak in five days. Carns said that he was proud of b...