"The suspected bomber tried to enter the mosque but was blocked by police, setting off a gun battle. The attacker then took refuge in a kitchen before detonating a bomb," the agency’s message reads, referring to Interior Ministry spokesman.
The attack was carried out while mosques around the city were crowded for a night of religious observances as part of the Islamic holy month of Ramadan.
Later Afghan TV channel Tolo informed that at least 6 people were killed, ten more got wounded as a result of powerful blast.
Al-Zahra mosque is visited by Shi'ite minority and suffered suicide bombings in the past.