The Sherpa guides had gone early in the morning to fix ropes for other climbers when the avalanche hit just them below Camp 2 at about 6:30 a.m., Nepal Tourism Ministry official Krishna Lamsal said from the base camp where he is monitoring rescue efforts.
Rescue workers pulled out 12 bodies from under mounds of snow and ice and were searching for the three missing guides, Lamsal said.
Two Sherpas who were injured were taken by helicopter to hospitals in Nepal's capital, Katmandu.
Hundreds of climbers, their guides and support crews have gathered at the base camp to prepare for attempts to scale the 8,850-meter (29,035-foot) mountain early next month when weather conditions become favorable. They have been setting up camps at higher altitudes and guides have been fixing routes and ropes on the slopes above.
As soon as the avalanche hit, rescuers and fellow climbers rushed to help.
