A search operation was on to locate two Indian climbers Paresh Nath and Goutam Ghosh who went missing on Mount Everest since Saturday. Officials said in Kathmandu that the two climbers were last seen near the Everest summit. Earlier, an official of the Mountaineering Department of Nepal's Tourism Ministry said, out of four Indian climbers who had gone missing, two were located yesterday. In the past two days, a Dutch and an Australian mountaineer have died of altitude sickness after scaling Mount Everest, days after an Indian climber lost his life after falling sick while descending Nepal's Dhaulagiri peak.