Dutch alpinist Martijn Seuren was climbing the 13,126-foot Aiguille de Rochefort, in the Alps, on the boarder of France and Italy, when he fell to his death late Wednesday afternoon. He was climbing with Swiss mountaineer Ueli Steck, one of the fastest in the world.
Steck posted about the incident on Facebook, writing to express his condolences to Seuren's family and friends and adding that he "won't add further comment to this tragic event."
The ascent was part of Steck's 82 Summits project, in which he plans to climb 82 summits, cycle 1,000 kilometers, and gain 100,000 meters of altitude in 80 days. Further details about the accident have not yet been reported.