Police say a bomb planted in a passenger bus has killed at least eight passengers in northwestern Pakistan.

Police official Fazal Wahid Khan says seven people were also wounded in Saturday's bombing on the outskirts of the northwestern city of Peshawar.

He says the bus was traveling from Peshawar to a nearby town.

No one immediately claimed responsibility.

Peshawar is the provincial capital of troubled Khyber Pakhtunkhwa province bordering Afghanistan. Security forces have carried out several offensives against Pakistani Taliban and other militant groups there.