Afghan officials say a suicide car bomber has killed four civilians and wounded 31 others in an attack on a NATO-affiliated provincial reconstruction team in southern Afghanistan.

A spokesman for the governor of Helmand province said Thursday that the attack took place Thursday in the provincial capital, Lashkar Gah.

Officials say the bomber hit a convoy of armed vehicles passing near the Education Department building. At least 17 civilian cars were damaged, some bursting into flames.

At least one member of the aid team was among the wounded.

NATO has declined to comment on the attack.