Emotions ran high at Kathmandu's Tribhuvan International Airport on Tuesday as officials brought out the coffins one by one and placed them in a hearse. Kili Pemba Sherpa, known widely as Kilu, along with Gyalu Sherpa and Nima Sherpa, arrived at Tribhuvan International Airport aboard a Qatar Airways flight from Doha. Of the five Nepali climbers, the bodies of four have been retrieved from one of the world's most technical mountains. Recovery efforts continue for the three climbers still on the mountain: one Nepali, one Pakistani and one American hampered by difficult high-altitude conditions. Some climbers and researchers attributed it to changing weather patterns that have made route assessment increasingly unpredictable in recent seasons.