According to Tolo News, the attack took place in the early hours of Monday and most of the victims are NDS employees. The Afghan Interior Ministry has confirmed the Ghazni blast, but refused to provide any further details.
"Unfortunately, the terrorists once again attacked a religious centre in Ghazni”, the ministry said as quoted by the broadcaster.
At the same time, no group including the Taliban radical movement has claimed responsibility for the attack yet, the broadcaster said.
The attack comes as part of an escalating cycle of violence between the Kabul government and radical, armed groups headed by the Taliban.
Afghan President Ashraf Ghani ordered his army to go on the offensive after two attacks earlier in May left scores dead at a maternity ward in Kabul and a funeral in Nangarhar Province, among other attacks.
The government and Taliban are attempting to strike a deal, following an agreement between the US and the militants. which seeks to end nearly two decades of war in the country and facilitate American troop withdrawal.