Sherpa : `` A big piece of ice suddenly came off the mountain '' No decision made on whether to go ahead with the climb , says Sherpa . There are now three people confirmed dead and 13 missing , an official says . This is the single deadliest accident on Sherpas ; May 15 to 30 .
Sherpa : `` A big piece of ice suddenly came off the mountain '' No decision made on whether to go ahead with the climb , says trek organizer . There are now 13 people confirmed dead and three missing , an official says . This is the single deadliest accident on Mount Everest ; the deadliest year was 1996 .