An Indian Army soldier, suspected to be working as a spy for Pakistan's Inter-Services Intelligence (ISI), was handed over to the Delhi Crime Branch sleuths on Sunday after he was arrested in West Bengal's Darjeeling district.

"Rifleman Farid Khan of the Jammu and Kashmir Light Infantry was detained by the army a few days back after some incriminating documents were found in his possession.

He was handed over to the police today (Sunday)," a defence spokesperson told IANS.

Investigators believe that suspected ISI spy was turned by ISI when he was posted in Rajouri district of Jammu and Kashmir. Farid Khan, it is believed passed on vital information to his ISI handlers.

The army detained him on 2 December in Siliguri, after the Delhi Crime Branch issued a formal request.

In the last two months, several ISI operatives have been nabbed by the police from Kolkata.

The Special Task Force of the police destroyed a spying ring after they arrested six ISI operatives. The STF men first caught up with Akhtar Khan, who is believed to have been running the fake Indian currency racket for Pakistan, on 14 November.

Soon the STF also arrested Akhtar's brother Zafar Khan.  The sleuths then arrested Irshad Ansari, Asfaq Ansari and Mohammad Jahangir for their alleged role in providing strategic information to the ISI.

From the arrested men, the police found a trove of documents besides high-quality FICN (fake Indian currency notes). The police also recovered several hand-drawn maps of defence PSU Garden Reach Shipbuilders and Engineers (GRSE) which builds warships for the Indian Navy.

On 2 December , the STF arrested Sheikh Badal, an accomplice who had allegedly forged their passports.

The Delhi Police in November busted an espionage racket with the arrest of a suspected ISI operative and a BSF head constable from Jammu and Kashmir.