Mountaineer says 11 dead , including sherpa who tried to rescue climbers . `` Coming down at dawn , in the dark , with little oxygen is very , very dangerous , '' he said . 17 climbers had made summit at K2 -- world 's second-highest mountain . - May 6 :
Mountaineer says 11 dead , including sherpa who tried to rescue climbers . 17 climbers had made summit at K2 -- world 's second-highest mountain . - May 6 :