Kathmandu, May 13 -- An American and a Swiss died on Mt Everest reportedly due to exhaustion while descending from the mountain, the first casualty of the season on the world's tallest peak, their expedition organiser Seven Summit Treks confirmed.

Chhang Dawa Sherpa, expedition manager of Seven Summit Treks, wrote on his Facebook page on Thursday morning that Abdul Waraich from Switzerland died near the South Summit at an elevation of 8,748 metre. He suffered from exhaustion.

"Abdul successfully reached the summit but began experiencing issues during his descent. We sent two additional Sherpas with oxygen and food, but unfortunately Sherpas couldn't save him," he wrote.

American Puwei Liu took his last breath at Camp IV (7,900m) while ...