Maoist posters have been seized from several villages under K Balang and Koida police limits of Sundargarh district in Orissa bordering Jharkhand and Chhattisgarh.
The posters were found pasted on road-side trees of National Highway 215 and in Jamdih, Ranjeda, Toda villages on Monday, the police said.
The posters, written in Hindi, carrying anti-government slogans alleged police action against tribal villagers in Chhattisgarh and Orissa, the police said.
The Red Rebels of Chhotnagapur zonal committee had strongly opposed anti-Maoist operation in Chhattisgarh.
Meanwhile, two businessmen of Lahunipada and Koida in Sundargarh district have received letters and threats over telephone by suspected Maoists to pay a levy.
A businessman of Lahunipada has received a letter asking him to pay Rupees two lakh while a crusher unit owner of Koida has received a call asking him to pay rupees five lakh as extortion.
Both the businessmen were warned of severe action if they informed the police.
The police was investigating the authencity of the threats.
Meanwhile, elaborate police arrangement have been made in bordering areas in Maoist-prone police limits in Bonai sub-division after seizure of the posters.