A pair of bombings in southern Afghanistan killed four policemen, police said.

Police official Gulab Khan said both incidents involved bombs hidden in motorcycles that exploded as police vehicles were passing by in Tarin Kot, capital of Uruzgan province.

Khan said the attacks occurred on Friday evening and Saturday morning and each killed two policemen. The attack on Saturday also wounded two policemen.

Khan is the provincial director of the criminal investigation department.(AP)