Another Sherpa guide died in Friday's Mount Everest avalanche, bringing the death toll to 13, a Nepalese government official said today.

It is the single deadliest accident on Mount Everest, officials said. Three others are missing, said Madhu Sudan Burlakoti of Nepal's Tourism Ministry.

A group of about 50 people, mostly Nepali Sherpas, were hit by the avalanche at more than 20,000 feet, said Tilak Ram Pandey of the ministry's mountaineering department.