"The blast occurred at 8:12 a.m. local time in Police District 8 injuring three civilians," Faramarz told Xinhua.
The official did not provide more details, saying investigation is underway.
Kabul has been the scene of targeted attacks, mostly in the shape of bombings, over the past few months.
Unknown militants often use magnetic bombs or light arms such as pistol to target government employees especially military personnel.
Although no group has claimed responsibility for the attacks, government officials usually blame the Taliban outfit for such attacks.