Gunmen stormed a hotel in a remote part of northern Pakistan and killed nine foreign tourists and a Pakistani guide near the foot of one of the world's tallest mountains.
Five Ukrainians, three Chinese, a Russian and their guide were killed in the attack.
The incident took place in a remote resort area near the base camp for the 8,125-metre snow-covered Nanga Parbat peak.
A Pakistani militant group known as Jundullah claimed responsibility for the attack.
The same group has claimed responsibility for a series of attacks on members of Pakistan's Shia Muslim minority in northern Pakistan.
The group carried out an ambush in February 2012 when gunmen shot 18 bus passengers by the roadside.
A senior government official said a large number of security personnel had been sent to the area.
Gilgit-Baltistan, which borders China and Kashmir, had been considered one of the more secure areas of Pakistan.
It has witnessed a spate of attacks by militants targeting members of Pakistan's Shia minority in recent years.
It was the first time foreign tourists had been attacked in the province, which is famous for its natural beauty.
Pakistan receives few foreign tourists, but a trickle of visitors is tempted by the spectacular mountain scenery in its northern areas, where the Hindu Kush, Karakoram and Himalaya mountain ranges converge.