Three mountaineers, who were attempting to summit the world’s second-highest mountain K2, have gone missing, reported AFP quoting their expedition manager and the Alpine Club of Pakistan.

Climbers John Snorri from Iceland, Juan Pablo Mohr from Chile and Muhammad Ali Sadpara from Pakistan reportedly lost contact with base camp on Friday.

Expedition manager Chhang Dawa Sherpa, releasing a statement, said there was no no news of John Snorri, Ali Sadpara, and Juan Pablo Mohr since last 30 hours and none of the GPS trackers seem to be working. 

An army helicopter has conducted a search flight for the missing climbers, Sherpa said in a separate statement.

The condition at the basecamp and on the mountain is getting poor, said Sherpa.

Karrar Haidri, Secretary of the Alpine Club of Pakistan, also told AFP that the climbers had gone missing on the mountain.

This comes days after a Bulgarian mountaineer was confirmed to have died on K2. He is the third mountaineer to die on K2’s slopes this year, after a Spanish climber fell to his death last month.

In January, Russian-American Alex Goldfarb died on a nearby mountain during an acclimatising mission.

A team of Nepali climbers made history on K2 last month when they became the first to scale it in winter.

Conditions on K2 are harsh: winds can blow at more than 200 kilometres per hour (125 miles per hour) and temperatures can drop to minus 60 degrees Celsius (minus 76 Fahrenheit).

Unlike Mount Everest, which has been scaled by thousands of climbers young and old, K2 is much less travelled due to its tough conditions.