French climber Elisabeth Revol, who was dramatically rescued last year from Pakistan's Mount Nanga Parbat, summited Lhotse Friday morning, a day after reaching the top of Everest, her expedition organiser said.
"She summited Everest yesterday and reached the top of Lhotse this morning. Her health is well and she is heading down from Camp 3 now," Rishi Ram Bhandari of Satori Adventures told AFP.
Everest and Lhotse share the same path until diverting at South Col at 7,900 metres (25,918 feet).
Revol was attempting to summit the mountains without supplemental oxygen -- becoming the first French woman to do so -- but Bhandari could not immediately confirm if she was able to do so.
Her Everest ascent clashed with dozens of other teams taking advantage of clear weather, and climbers lined up for hours to reach the top -- risking frostbite and altitude sickness.
Last year, Revol and Polish climber Tomek Mackiewicz were attempting to scale the 8,125-metre (26,660-foot) Nanga Parbat in winter, when they ran into trouble.
She had been forced to separate from Mackiewicz, who was suffering from snow blindness and was coughing up blood, a sign of oedema, or acute mountain sickness. Mackiewicz was never seen again.
The team of elite Polish climbers found her in a daring night rescue after she had already spent two days above 6,000 metres without a tent on the world's ninth-highest mountain.
Expedition organisers confirmed three more deaths on Everest on Friday, taking the toll from a deadly week on the overcrowded peak of the world's tallest mountain to seven.