Authorities in southern Afghanistan say a suicide car bomber has killed at least three people, including a local district chief.

Provincial officials say the head of the Kandahar province's Panjwayi district was traveling in his car with his two sons when the bomber rammed his vehicle full of explosives into them. All three were killed in Thursday's blast.

The attack wounded at least nine other people.

On Wednesday, Kandahar's police chief escaped unharmed after a suicide bombing outside his office in Kandahar city.

There has been no claim of responsibility for either attack.