The incident took place at 10:00 am (5:30 GMT).

According to the source, the bomb was planted on a car of the deputy head of the Kunduz NDS office. When the vehicle entered the building’s premises and the official went to his workplace, a bomb detonated.

Four people were injured, including the deputy's driver.

No militant group has claimed responsibility for the blast yet.

Afghanistan has witnessed a rise in bomb blasts and violent clashes since the beginning of Kabul-Taliban talks in Qatar, despite both sides expressing their desire to reach a secure and long-lasting ceasefire