The security forces and intelligence agencies first got the clue that the GJM was using radio signals as a mode of communication when two radio sets were seized during the June 15 raid on the premises of some Gorkha Janamukti Morcha (GJM) leaders.
It was then that the police administration decided to deploy a group of Ham radio operators to track the radio communication of GJM activists.
The operators picked up the suspicious cross border signals during the drill.
Ham or amateur radio operators are under the ministry of communications and are licenced card holders to conduct such communication under specific radio frequencies.
A team of ham radio operators is monitoring the radio signals round-the-clock and another team of language experts is helping the officials break the coded language, he said.
Radio communication among leaders of pro-Gorkhaland leaders and activists has increased by "leaps and bounds" after Internet services were suspended on June 18 and their phones are being tracked by the agencies, the official said.
According to official sources, the GJM has imparted radio communication training to its cadres and has also set up small temporary radio stations in various parts of the hills. It is through these radio stations that such signals are being sent and received.
"Some of the radio communications have pointed out that they were well prepared for a showdown and the violence in the hills is not just an incident which happened in the heat of the moment. It was pre-planned," said an official.
GJM General Secretary Roshan Giri, however, denied recovery of any kind of radio sets and called it a malicious campaign of the state government to defame the party.
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