A foreign military convoy has been hit by an explosion in the Afghan capital, Kabul, leaving at least 16 people injured, Afghan sources say.

The blast took place on the airport road near the US embassy.

Afghan officials say a suicide car bomber carried out the attack. The Taliban says it was responsible.

The blast comes amid uncertainty over disputed presidential elections and over the withdrawal of most NATO troops by the end of this year.

Correspondents say that Taliban insurgents have taken advantage of the uncertainty to launch bombings and attacks.

In July a Taliban suicide bomber killed four people, including at least three foreign security guards, in an attack on a key counter-narcotics building outside Kabul airport.

That attack came days after security forces repelled an attack on Kabul airport by the Taliban, reports the BBC.