Aftermath- Afghans look at the bomb wreckage |
Four US troops suffered minor injuries in the bombing, the second suicide attack in two days in the Afghan capital.
The convoy was targeted as it passed through the Yakatot neighbourhood, where US and Nato forces maintain complexes.
Facilities operated by the Afghan National Security Forces are located nearby.
Police spokesman Firdous Faramaz said four civilians were killed and three wounded.
In a telephone interview, Taliban spokesman Zabihullah Mujahid took responsibility for the attack, claiming 10 US soldiers were killed.
Witnesses said the explosion was powerful, blowing out windows in neighbouring buildings.