Mohammad Azad, a cleaner in the traffic department of the army's 33 corps headquarters at Sukna, was arrested from near New Jalpaiguri railway station yesterday, Darjeeling SP Kunal Agarwal said.
The arrest was made on the basis of a FIR filed by the commanding officer of the civil government traffic department based at the 33 corps headquarters.
Azad used to send documents and photographs of army installations to the Pakistani spy agency agents in Delhi, Agarwal said.
Azad is a resident of Khaprail in Kurseong subdivision of Darjeeling district.
The action against him followed the arrest of five persons on May 19 for allegedly supplying important documents on army and air force installations and troop movements to ISI agents based in Nepal.
The five - former army driver Maghan Bahadur Singh, Mesha Sauria, Dhan Bahadur Pradhan, Gopal Khati alias Biswakarma and Mani Kumar Biswakarma, an upper division army clerk in Sukna - were arrested following the inputs given by one Bidyut Kumar Sinha - an upper division clerk with the Army Supply Corp in the South Western Command, Jaipur - who was held on May 14.