A senior police officer said the district administration has also sent a report to the Election Commission in connection with the murder.
"Till now 12 people have been detained and further raids are on," the officer said.
Joydeb Jana (30) was attacked with sharp weapons, lathis and iron rods by a group of armed men allegedly belonging to Congress and CPI(M), when he was returning home last night, the official said.
Jana was declared brought dead at the local hospital.
Local Trinamool Congress leader Amulya Maity alleged that Jana was beaten to death in the presence of Bhunia, which was denied by Congress leaders.