The death toll from a traffic jam of climbers on Mount Everest in the Himalayas, the world's highest summit, has risen to 10, officials said, as a record number of people tried to use a brief window of good weather to make it to the top.

The latest casualty on the mountain was identified as Robin Haynes Fisher, 44, of Britain, who died at 28,215 feet (8599m), authorities said.

Sherpa guides on the Nepali side of the mountain have complained that the traffic jam at the last stretch of the climb, called "the death zone," has become the most serious