Gilgit, August 4 (ANI): A Pakistan Army helicopter began airlifting frost-bitten survivors from the slopes of K2 on Monday. The Army left behind at least 11 dead climbers after an ice fall near the top of the world's second highest mountain. The helicopter was due to return to ferry Italian climbers down from another spot on the remote 8,611 metre peak deep in the Karakoram Range, bordering China.