KOLKATA: A retired junior commissioned officer (JCO) of the Indian Army was arrested by Barrackpore police early on Wednesday on charges of passing on sensitive information to Pakistan's ISI.

Subedar (retd) Madan Mohan Pal was arrested when he was passing on information to somebody over the phone, say police sources. He was produced before a special court and remanded in 13 days police custody. He will be interrogated by military intelligence on Thursday.

Pal, 56, retired from the Army in 2008. He was last posted at Udhampur in Jammu and Kashmir. A Bongaon native, he was living in the Siuli area of Titagarh for the last few years. Security agencies were tipped of about his activities in 2011 and started tracking his movements and phone calls, say sources.

"We believe he is part of a larger racket involved in procuring sensitive information about security forces and passing them on to agencies like ISI. When we raided his home, he was speaking on the phone and passing on information to someone. We have seized several incriminating documents from his house and got several names. Three computers and bank documents were seized," said Barrackpore detective chief Debashis Bej.

Pal allegedly received Rs 20,000 per month for passing on information. Sources said he would speak to former colleagues who are still in the Army and learn about movements and strategic positions along the LOC. "We are carrying out our own investigation and will seek his custody," an Army spokesperson said.