The attack happened in Kurram, a district in Khyber Pakhtunkhwa province, ABC News reported.
No one immediately claimed responsibility for the latest attack. It came a week after authorities reopened a key highway in the region that had been closed for weeks following deadly clashes.
Local police official Azmat Ali said several vehicles were traveling in a convoy from the city of Parachinar to Peshawar, the capital of Khyber Pakhtunkhwa, when gunmen opened fire. He said at least 10 passengers were in critical condition at a hospital.
Interior Minister Mohsin Naqvi said at least 38 people were killed in the “terrorist attack." Prime Minister Shehbaz Sharif and President Asif Ali Zardari condemned the attack, and Sharif said those behind the killing of innocent civilians will not go unpunished.
MNA