The incident occurred in mountainous Dogdara area of the Upper Dir district in the Pakhtunkhwa province bordering Afghanistan.
Those died in Dir upper blast were members of a peace committee.
A remote-controlled bomb, planted in the double cabin vehicle, went off, killing seven people. No occupant of the vehicle survived.
According to police, local peace committee Chief Haji Motabar Khan was the target of the bomb blast.
However, police said the peace committee chief was not in the vehicle targeted.