Afghan police say a suicide car bomber has targeted a convoy of foreign military vehicles in the capital, killing at least five Afghan civilians and wounding several others.
The Hezb-e-Islami insurgent group has claimed responsibility for the Thursday morning attack in Kabul. A spokesman for the group said American advisers were the targets.
NATO's International Security Assistance Force said it was aware of the explosion and was looking into reports of casualties.
Hezb-e-Islami is a militant group which shares some of the anti-foreigner, anti-government aims of the Taliban.