A Taliban suicide bomber killed at least 13 people when he rammed his car into a minibus carrying Afghan soldiers today.
A defence ministry spokesman, said six soldiers and seven civilians, four of them children, were killed in the attack.
The bomber struckin the Chihulsutoon area south of Kabul, the third suicide attack in the city in the last eight days.
It follows a similar attack against a Nato convoy yesterday that left 22 civilians wounded.
There has been a spate of attacks in recent months on buses carrying Afghan security forces as they commute to work in the morning.
In September a suicide bomber blew himself up inside an army bus in Kabul, killing 28 soldiers and two civilians. In June, another bomb ripped through a bus carrying police instructors in Kabul, killing 35 people.
Militants have launched more than 133 suicide attacks this year, a record number. At least 6,200 people have died in insurgency-related violence in 2007, also a record.
Suicide attacks frequently target international and Afghan security forces, but most of the casualties are civilian passers-by.
Meanwhile in southern Afghanistan today coalition troops killed several Taliban militants during raids on compounds in Garmser district.
Separately, an explosion struck a patrol of Nato-led troops in southern Afghanistan yesterday, leaving one British soldier dead and two others wounded.