Sadpara, John Snorri from Iceland and JP Mohr from Chile have not been contacted since the three began their push for the K2 summit from camp 3 at midnight between Thursday and Friday.
A Twitter message from the official account of the Government of Pakistan also prayed for the safe return of Muhammad Ali Sadpara and other fellow mountaineers.
A team of Pakistani and foreign climbers had begun their expedition to ascend the second highest mountain of the globe, K2, without oxygen to set a world record.