Nepal has banned solo climbers from scaling its mountains, including Mount Everest, in a bid to reduce accidents.
A tourism official said the law had been revised to make mountaineering safer and to decrease deaths.
A record number of climbers have tried to climb Everest this year.
World-renowned Swiss climber Ueli Steck, who was known as the "Swiss Machine", also died during a solo climb to a peak neighbouring Everest.
Media playback is unsupported on your device Media caption A British-born climber is using new methods to scale Mount Everest in half the time.
More than 200 people have died on Everest since 1920, with the vast majority of those deaths taking place since 1980.
Mountaineers on Everest die for a number of reasons - more than 20% are killed by exposure or acute mountain sickness. »
