after a fatal avalanche. 16 nepalese sherpas were killed. their colleagues are demanding improved conditions and better way. we have more. . >> reporter: getting to the summit of mt everest is a tough challenge. many do not do it alone. they need the help of guides or sherpas. they show the way, carrying supplies. it puts them at rick. >> friday's avalanche struck while the sherpa's made the way safe. 13 were killed, three were unaccounted for. >> it's a terrible tragedy. great loss of life and the families and villages that will be impacted by this loss. >> the guides are now refusing to go up the mountain until certain demands are met. they want a bigger pay out. aid for the families and regulations to ensure the