Bhopal's Anti Terrorist Squad (ATS) on Saturday arrested Sahyog Singh in connection with the Pakistan's Inter-Services Intelligence (ISS) - backed espionage ring.
This is the 12th arrest in the case.
Singh is the close aide of mastermind Balram Singh who, along with Manish, Mohit and Dhruv, was sent to police remand till February 18.
However, accused Manoj and Sandeep have been sent to jail.
Earlier on February 9, ATS busted an international call racket that allegedly helped ISI agents to spy on India's military operations.
ATS chief Sanjeev Shami said that the accused were arrested in November 2016 in Jammu for collecting and using information of strategic interests for espionage.
"They were being funded by a person in Satna. Five persons from Gwalior, three from Bhopal, two from Jabalpur and one from Satna arrested," he said.
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Shami further said the accused converted internet calls to cellular network and acted as medium for overseas handlers to contact people in India.
"The arrested men are accused of supplying information regarding army and Air Force in Madhya Pradesh. Complicity of some employees of telecom companies also surfaced," he said.
In January, the Uttar Pradesh ATS had arrested 11 people who were running a similar exchange.
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