The four-colour posters are seen in almost all areas, including Bagmara Bazar, Shikdari, Jhikra, Jugipara, Ahsanganj, Goalkandi, Hamirkutsa and Jatapukur, calling upon the people to join PBCP.

Quoting local people, police said the posters might have been pasted before Sunday morning.

Slogans in the posters include: Downtrodden people of the world, unite. Join PBCP. Uphold the red flag of Mao Tse Tung, Lenin and Marks. Follow the teachings of Charu Majumdar."

Reacting to this, a local businessman told this correspondent over phone: We are alarmed. Where from the posters came if police and Bangla Bhai's men have routed all the outlaws?

But police officials interpreted this a different way. "Bangla Bhai's men freed from jail are regrouping. They have been holding regular meetings in the last few days. They might be behind pasting of the posters to create plea for a comeback ", said a senior police official seeking anonymity.

Supporting his view, a local journalist said, "It is natural as Bangla Bhai's target was their political opponents".

Followers of Bangla Bhai, known as Jagrata Muslim Janata Bangladesh (JMJB), killed about 22 people and tortured several hundred since April last year for their alleged involvement with PBCP.

Besides, 15 alleged outlaws were killed in crossfire with and police and Rab (Rapid Action Battalion).

Golam Kibria, officer in charge of Bagmara police station, said police are investigating the matter.

"Some left party leaders held a meeting in Bagmara last week. They might have brought the posters ".

Meanwhile, different sources claimed that JMJB men who were released from jail several weeks ago were holding regular meetings.

They control groups of people who are guarding villages at night by turns, the sources claimed.

On Saturday night, JMJB men held meetings at the houses of Belal, son of Hossen Ali and Meraj, son of Abdur Rahman in Goalkandi, police said. Belal and Meraj are alleged associates of Bangla Bhai, they said.