Kathmandu, Feb. 5 -- Nepal has officially ended solo expeditions on Everest and other 8,000-metre peaks by amending its mountaineering regulations.

The Sixth Amendment was implemented on Tuesday following its publication in the Nepal Gazette, the official government publication.

The revised regulations bar solo expeditions and require that a guide is assigned for every two climbers for peaks above 8,000 metres, including Everest. For other mountains, the rule requires at least one guide per group.

"We have made guides mandatory to ensure climbers' safety, particularly on the 8,000ers," said Narayan Prasad Regmi, director general of the Department of Tourism, the government agency responsible for issuing climbing permits.

"The solo cli...