Unidentified miscreants hurled bombs at All India Trinamool Congress' (TMC) office in Naihati.
The incident was captured on multiple CCTV cameras.
The workers of TMC blamed BJP for the attack.
It is not the first time that these kinds of incidents are taking place in West Bengal.
On December 05, crude bomb was hurled at BJP workers during a rally, which took place in Paschim Bardhaman district.
BJP that time alleged TMC's involvement in the incident.
Assembly election will be scheduled in West Bengal in coming month.
