Abdul Waraich, 41, of Switzerland and American Puwei Liu, 55, died of exhaustion while descending the slopes of the 8,848.86 metre mountain, expedition organisers said.
Pakistani mountaineer Ali Sadpara and his two companions, John Snorri of Iceland and Juan Pablo Mohr of Chile were reported missing during their ascent of 8,611-metre high K2 mountain, also referred to as "killer mountain."
Wearing traditional woollen hats and festooned with garlands, the climbers were received as heroes on the first leg of their journey back home.
The climbers made history as they reached the peak of what is known as the "Savage Mountain" where winds can blow at more than 200 kilometres per hour and temperatures can drop to minus 60 degrees Celsius.
Ang Rita, also known as the "Snow Leopard," climbed Mount Everest 10 times without the use of supplemental oxygen.
John Griffin took four days to climb 41,000 steps at his three-story house, equivalent to the 8,850 metres (29,035 feet) that the world’s highest mountain measures.
Global chaos continues as deaths rise in Iran and Italy owing to deadly virus first detected three months ago in China.
Nirmal Purja, 36, climbed eight mountains in Nepal, five in Pakistan and one in Tibet in just over six months.
An official of the Pakistan Alpine Club says authorities are dispatching a helicopter to northern Ghizar district on Tuesday in a bid to rescue four Italians and three Pakistani climbers stranded due to an avalanche.
Authorities says mission to recover climbers' bodies likely to take 10 days.
Th climbers, from Britain, the United States, Australia and India, had been trying to climb the summit of Nanda Devi, the second-highest peak in India, and were probably hit by a large avalanche, officials say.
Rizza Alee, an 18-year-old climber from India-administered Kashmir, said "massive traffic jams" up the mountain had made scaling the world's most sought after climb "a death race."
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