Three climbers died on Mount Everest on Sunday, taking the death toll on the world's highest mountain in the past month to at least five amid mountaineers' safety concerns, officials said on Monday.
A 54-year-old Australian, Francesco Enrico Marchetti, died on the Tibetan side of Everest, while Vladimir Strba, 48, of Slovakia, perished near the Balcony in the south in Nepal, officials said. American climber Roland Yearwood also died on Sunday. Contact has been lost with an Indian after he scaled the peak on Saturday.
Marchetti died due to apparent altitude sickness about 8,300 metres (27,230 feet) above sea level while on his summit approach, said Navin Trital of the Expedition Himalaya company that coordinated logistics for the climber.
"He fell sick and died while being brought down to a lower camp," Trital said. He was unable to give details because of poor communications with the team.
Strba died at around 8,400 metres (27,500 feet) in the "death zone", on the Nepali side where the air is very thin, Tourism Department official Gyanendra Shrestha said on Monday. He also said the exact circumstances leading to Strba's death were not clear.
Roland Yearwood, 50, from the US state of Alabama, perished at an altitude of about 8,400 metres (27,500 feet).
Yearwood was part of a 16-member team led by American climber Dan Mazur that is climbing the normal Southeast Ridge route from the Nepali side of the mountain.
The deaths came a day after an Indian climber fell 200 metres (650 feet) to his death after scaling the peak a day earlier, a Tourism Department official said.
On April 30, a famed Swiss climber fell to his death near Mount Everest while preparing to climb the world's highest mountain. An 85-year-old Nepali man died at base camp earlier this month while trying to set a record for the oldest climber.
This year's Everest expeditions have been confronted by bad weather and high winds.
"There have been deaths on both sides. While few details are provided, it appears these were associated with altitude, not weather," American blogger and climber Alan Arnette said in a post.
Nepal has cleared 371 climbers to Mount Everest in the current season, which ends this month. Nearly 200 climbers went to Tibet, from where the 8,850 metre (29,035 feet) Everest Summit can also be climbed.