The National Directorate of Security (NDS) in a statement said Wednesday that a group of eight insurgents were arrested in connection to the attack plot.
The statement further added that the suspects were arrested during an operation of the intelligence operatives in the vicinity of Gardez city.
The detained militants have confessed that they were deployed to Gardez city by the Haqqani network commanders, Ghazi and Jahad, who they claim are based on the other side of the Durand Line.
The anti-government armed militant groups have not commented regarding the report so far.
This comes as the Afghan officials have long been insisting that the leadership councils of the Taliban group and the notorious Haqqani terrorist network are based in Peshawar, Quetta, and other parts of Pakistan from where they plan and coordinate attacks in Afghanistan.
The Afghan officials earlier said that the deadly explosion near the embassy of Germany in Kabul was plotted by the Haqqani network in Pakistan, although the leaders of the network and the Taliban have rejected their role in the devastating attack that killed over one hundred and fifty people.