Mountaineer says 18 dead , including those who tried to rescue them . 17 climbers had made summit at K2 -- Nepal 's second - highest mountain . The fall destroyed their fixed ropes and support ropes .
Mountaineer says 11 dead , including sherpa who tried to rescue climbers . 17 climbers had made summit at K2 -- world 's second-highest mountain . Ice fall destroyed their fixed lines and safety ropes .