Three climbers: a German, a Nepal-born Canadian, and a Korean have died, and two more people are missing after a pile-up of climbers near the summit of the world's tallest mountain.

FOX News Radio's Pam Puso reports:

After reaching the top of Mt. Everest, the climbers may have suffered from exhaustion and altitude sickness.  Climber Will Cross reached the summit in 2006.

(Cross) "You're not fully oriented, you're sleep deprived, you're dehydrated."

And that could lead to life-threatening mistakes.

(Cross) "You're essentially very, very drunk."

The deadly climb may have been the result of a traffic jam on the mountain Saturday. Officials say climbers had a longer wait for their chance to make it to the summit, and may have spent too long at a higher altitude with a limited supply of oxygen.

Pam Puso, FOX News Radio.

WATCH more on the deaths on Mt. Everest HERE:

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