Arun Selvarajan was arrested by NIA for his alleged involvement in espionage activities at the instigation of Pakistan, official sources said tonight.
Selvarajan was found in possession of two passports -- Sri Lankan and Indian, they said.
He is learnt to have gained access to certain vital installations under the guise of managing events, a statement issued by NIA said without mentioning where he was apprehended.
"Selvarajan was passing on information using internet communication tools. Incriminating evidence has been seized from him which is under scrutiny", the statement said.