A government official says a suicide car bomber has attacked a district police headquarters in southern Afghanistan following a series of suicide attacking proliferation on Afghan national troops, killing five policemen.

Javid Faisal says the attack on Thursday in Kandahar province's Argistan district also wounded six policemen. Faisal is the spokesman for the provincial governor.

Kandahar is the spiritual heartland of the Taliban and has been one of the most heavily contested areas between the militants and Afghan and foreign forces. (AP)