"There has been a surge in their activities in the past six months. We have specific reports of their movements both individually and in small groups, especially in Binpur, Lalgarh, and parts of Purulia," a senior CRPF officer, overseeing anti-Maoist operations in the state, told PTI.
Joint forces of CRPF and West Bengal Police have been conducting raids in the Junglemahal, which comprises forested parts of West Midnapore, Bankura and Purulia districts, to keep a tab on Maoist activities, the officer said on the condition of anonymity.
Kishenji, who was leading the rebels' activities in the state, was killed in an encounter with the joint forces on November 24, 2011. The state had witnessed a spurt in Maoist violence towards the end of 2008.
"I can't say that they are not regrouping. Because they have been making efforts to regroup for quite some time. But we are on high alert and there has been no instance of Maoist violence in Junglemahal area in last four years," IG (CRPF) West Bengal sector Vivek Sahay told PTI.
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"In comparison to past three years, since last six months there has been a surge in their movements... Although it's not too big but this time during Martyrs' Day observed by the Maoists there has been a partial response in the areas," a senior state Intelligence Bureau official said.
According to officials, the squads of Maoist leaders Bikash in Lalgarh area (West Midnapore), Ranjit in Ayodha hills (Purulia), Madan Mahato in Jambani, Akash, and Jayanto are trying to regroup and recruit new people.
The officials also stated that there are reports these leaders visit villages either individually or in small groups and are trying to rejuvenate sleeping cells and sympathisers of the red ultras.
According to IB officials, for the first time in four years, Peoples' Committee Against Police Atrocities (PCPA), an organisation backed by Maoists, and Maoist posters were found in Junglemahal area during the Martyrs' Day observation.