It is feared the death toll may rise after an accident on the world’s second-highest mountain.
At least nine people are known to have perished after an avalanche on K2 in northern Pakistan.
Thirty-seven-year-old Gerard Mcdonnell is one of the missing. He was the first Irishman to have reached the 8600 meter summit. Frenchman Hugues d’Aubarede is also unaccounted for.
Experts say any climbers stranded above the site of the avalanche may have to climb down to safety in China.
Friday’s accident happened when an avalanche swept away climbing ropes in a gully known as the Bottleneck.
At least 22 climbers are thought to have been on that section of the mountain at the time.
The previous most deadly day on K2 was on August 13, 1995, when six people including British woman Alison Hargreaves lost their lives.