An investigation has been launched into the death of a Pakistani porter near the peak of the world’s most treacherous mountain, following allegations that dozens of climbers eager to reach the summit had walked past the man after he was gravely injured in a fall.

The accusations surrounding events on July 27 on K2, the world’s second-highest peak, overshadowed a record established by Norwegian climber Kristin Harila and her Sherpa guide, Tenjin. By climbing K2 that day, they became the world’s fastest climbers, scaling the world’s 14 highest mountains in 92 days. Harila rejected responsibility for the death of porter Mohammed Hassan, 27, a father of three who slipped and fell off a narrow trail.