The rebels observe the martyrs' week from July 28 to August 3 in the memory of their slain comrades.
The ultras have put up banners and posters in some places, appealing the people to participate in the martyrs' week. The district borders on Chhattisgarh.
A police release said that an unidentified woman Naxal was killed in an encounter in the forest near Bhimpur village under the jurisdiction of Pendhri police station this morning.
She had not been identified yet, it added.
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A rifle, 25 backpacks, five tents and Naxal literature were found on the spot.
Meanwhile, the buses of Maharashtra State Road Transport Corporation (MSRTC) have stopped plying in remote areas of the district, fearing increased violence by the Naxals during the week.
Pavan Wasamwar, the chief of MSRTC bus stand here, said buses were not plying in Bhamragad, Sironcha, Korchi, Malewada, Manpur, Rangi, Etapalli, Angara, Vikaspalli, etc.