A person, suspected to be an agent of the ISI, was arrested on Tuesday as police cracked an undercover module working for the Pakistani intelligence agency in Faridabad.
Haroon (60) was arrested from Mewat, around 60 kms from Faridabad, this evening on charges of passing on sensitive information to ISI agents.
Police also seized some "vital documents" from the 60-year-old barber shop owner, who is being subjected to intense interrogation.
"We arrested him on the basis of information provided by Khalid alias Azad, a Pakistani national and agent of the ISI who was arrested in May," Superintendent of Police (Faridabad) Mahender Singh Sehram informed.
Khalid was arrested along with two of his accomplices, identified as Mehmood and Manazer, on May 17 while allegedly passing on secret information about Indian forces to a person going to Pakistan.
Police believe Haroon was part of an ISI underground module operating in the area.