KATHMANDU, Nepal — An American climber has died near the summit of Mount Everest and an Indian climber is missing after heading down from the mountain following a successful ascent, expedition organizers said Sunday.

Roland Yearwood, 50, from Georgiana, Alabama, died on the mountain Sunday but other details were not immediately known, said Murari Sharma of the Everest Parivar Expedition agency, based in Kathmandu, Nepal’s capital.

Indian climber Ravi Kamar fell sick on his way down from the summit Saturday and did not make it to the nearest camp, while his accompanying Nepalese Sherpa guide made it to a camp, said Thupden Sherpa of Arun Treks and Expedition.

The guide also fell sick, but he managed to drag himself to the last camp at South Col, located at 26,247 feet, Sherpa said, adding that the guide had frostbite and was hooked to oxygen bottles.

A rescue team of three Sherpas flew by helicopter to Camp 2, from where they were climbing up the mountain to help search for the missing climber.