A precarious journey: Pakistani porters navigate tradition and modern challenges on the trek to K2
Pakistan is home to five of the world's 14 tallest mountains
Four Indians have already died in separate incidents on Everest this year
Photographs show the 65-year-old president in a khaki outfit and hat, carrying binoculars and trekking poles
We looked down the ridge, we looked in the valleys, we looked everywhere, we triple checked, says search team leader