Officials said a police van was targeted with a roadside bomb in Mandi area. A policeman was killed and two more were injured.
Earlier, an attack by a suspected suicide bomber in Bannu wounded four paramilitary Frontier Corps personnel and two passers-by, media reports said.
Officials said the suspected bomber rammed his motorcycle into a security forces vehicle. Security forces cordoned off the area and conducted a search operation.
Another bomb attack on the outskirts of the provincial capital of Peshawar injured three persons.
Rescue teams took the wounded to hospital while security forces cordoned off the area and conducted a search.
No group claimed responsibility for the attacks.