The accident took place on the Babusar Pass in Diamer district. The bus was en route to Rawalpindi from Skardu, the Dawn newspaper quoted Diamer police spokesperson Mohammad Wakeel as saying.
He said that the driver lost control of the bus, resulting in the bus crashing into a mountain, Indo-Asian News Service reported.
The Babusar Pass road, frequently used by tourists, remains open from the end of June to October every year. It then remains closed following heavy snowfall at Babusar Top.