Led by the party's district president Doodh Kumar Mondal, BJP activists entered the DM's office premises and raised slogans.
The law violation programme was organised to demand arrest of the killers of a party worker in Makra, stopping of alleged torture on BJP workers by the police and security of BJP activists, Mondal said.
There has been political violence between BJP and Trinamool Congress in Makra and Parui areas of the district since late last month.