An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Gurinder Osan, file)

Photos: Mount Everest avalanche

The world's highest mountain has seen its deadliest-ever disaster on Friday, April 18, 2014. More » Story: Deadly Everest avalanche