"...The party (CPI-Maoist) is trying to develop the tri-junction of Karnataka, Kerala and Tamil Nadu as a suitable operational base," according to a six-page letter sent to 13 states, including Jharkhand, by the Ministry of Home Affairs.
Tamil Nadu remains largely unaffected by the Maoists, the letter said, adding that some party (Maoist) activity was found in Karnataka and Kerala.
Maoist activity not necessarily meant violence as it comes at the fifth stage of the Maoist strategy, it said.
The Malenadu region comprises of Chickmagalur, Shimoga, Udupi, Hassan, Kodagu and Dakshina Kannada districts of Karnataka and Maoist documents state Malenadu "as the strategic midrib of peoples' war in Karnataka...," the letter said.
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The letter based on the intelligence assessment as on March 8, 2013, said the recent recovery of a party (CPI-Maoist) document in Kerala's Kannur indicated formation of a "Western Ghats Special Zonal Committee" which would include Karnataka, Kerala and Tamil Nadu, "but details are still not available".
The tribals would be isolated following the foreign focus on Bio-Technology in the forest reserves such as Kudremukh, Pushpagiri, Nagarahole, Mudumalai and Satyamangalam, it said.
The letter said efforts to revive the Maoist movement in Karnataka were in evidence, particularly in the tri-junction of the three states, seven years after the Karnataka Maoist unit received a setback following a determined police action and a split in the rebel ranks.
According to Kerala state intelligence, the letter said, the banned outfit has recently formed a nine-member State Committee.