Many posters, allegedly pasted by Maoists, have been found in Chaibasa, headquarters of West Singhbhum district, the police said.
The police have removed the posters pasted in and around the Kolhan University and nearby Tata College under Muffasil police station.
One of the posters threatened to avenge the killing of 12 ultras by security forces on June 9.
However, the police have said that it was the handiwork of some miscreants, whom the police were searching.
