Twelve more were wounded in the blast which happened in Sarai Chuqurak area, PD 10 of the city, said Akmal Samsor, a spokesman for Public Health Ministry.
Police said that the explosion was triggered by a magnetic bomb attached to a car.
There was no immediate claim of responsibility for the attack.
It comes three days after a suicide bomber killed 24 people and wounded 57 others outside an education center in Dasht-i-Barchi area of the city.
Source : Afghan Voice Agency(AVA)