Attackers dressed in police uniforms stormed a base camp at the foot of Nanga Parbat late Saturday, shooting dead the climbers and a Pakistani guide at point-blank range, officials said.
The victims have been identified as an American with dual Chinese citizenship, three Ukrainians, two Slovakians, two others from China, a Lithuanian and a climber from Nepal.
Pakistan's umbrella Taliban movement claimed responsibility, saying it had set up a new faction, Junood ul-Hifsa, to kill foreigners to avenge US drone strikes on Taliban and Al-Qaeda operatives.
It is a major blow to foreign trekking expeditions, which provide the last vestige of international tourism in a country where Islamist militants have killed thousand of people in recent years.
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Naiknam Karim, general secretary of the Pakistan Association of Tour Operators, said the killings were a "disaster" for Gilgit-Baltistan, where tourism is the main source of income.
"It will destroy tourism in our area," he told AFP, saying that he had already received a slew of cancellations by email and telephone.
The Al-Qaeda attacks on the United States were followed by in war in neighbouring Afghanistan, a series of backlash attacks in Pakistan and since 2007, Pakistan's own domestic Taliban insurgency.
An average non-trekking tourist spends USD 3,000 in the area of stunning natural beauty, but trekkers sink USD 8-10,000 into the local economy, staying for longer as well as hiring guides and porters, Karim said.
"We used to be able to convince foreign tourists that there was peace in Gilgit-Baltistan but this incident has ruined everything," he told AFP.