The officials in Balochistan have told local media outlets that the four Afghan nationals were among at least twelve people rounded up by the security forces from the vicinity of Pishin district.
The officials have also added that the security personnel have discovered the passports of Afghanistan from the detained individuals.
However, they have not elaborated further regarding their claims and the espionage allegations against the detained Afghan nationals.
According to the officials, the four Afghan nationals were arrested during an operation conducted on Surkhab Refugee camp.
This is not the first time reports emerge regarding the arrest of the Afghan nationals by the security personnel of Pakistan on charges of having links with the security institutions of Afghanistan.
The latest claims by the Pakistani officials regarding the arrest of NDS suspect come amid strained relations between the two countries regarding the circumstances surrounding the fight against terrorism.
The Afghan officials are saying that the leadership councils of the Taliban and Haqqani network are based in the key cities of Pakistan, including Quetta, the provincial capital of Balochistan, from where they plan and coordinate deadly attacks in Afghanistan.