Kabul - The blast was detonated by a suicide bomber in the car.
At least seven people were killed and seven wounded when a car bomb detonated during Kabul's busy morning rush hour on Wednesday, an interior ministry spokesman said.
The spokesman, Nasrat Rahimi, said the bomb had gone off in a neighbourhood which is near the interior ministry and north of Kabul airport.
He said the dead were all civilians. "This is the initial information, more details later," he added.
A source at the interior ministry said the blast was detonated by a suicide bomber in the car, and that it had targeted a convoy of government vehicles on a main road.
The blast came one day after Afghan President Ashraf Ghani announced that Kabul would release three high-ranking Taleban prisoners in an apparent prisoner swap with Western hostages who were kidnapped by the insurgents in 2016.
The three Taleban prisoners include Anas Haqqani, who was seized in 2014 and whose older brother is the deputy Taleban leader and head of the Haqqani network.