Police say a roadside bomb has exploded near a passenger bus in north-western Pakistan, killing at least three people.

Police officer Zahir Shah said seven people were also wounded in Saturday’s attack in the Upper Dir tribal region in the northwest Khyber Pakhtunkhwa province.

No one immediately claimed responsibility, and Mr. Shah said the dead and injured had been transported to a hospital.

Upper Dir is located in Pakistan’s volatile northwest near the Afghan border and it is considered a sanctuary for militants. The Pakistani army with help from local tribal elders has launched several offensives against militants there, but violence has continued.

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