BJP national secretary Rahul Sinha alleged that 10-15 party workers were injured when Trinamool Congress Chhatra Parishad activists pelted them with stones.
Carrying TMC flags and shouting slogans against Prime Minister Narendra Modi, the agitated party workers accused the BJP of pursuing vendetta politics.
Sinha said five to six cars belonging to the party were damaged and Modi's effigies set alight, he said.
Sinha was present inside the party office during the attack.
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Traffic in the area was thrown into disarray because of the protest.
Incidentally, the BJP office is situated in central Kolkata which is part of Sudip's Lok Sabha constituency.
"Yes, we are protesting against the BJP because of the vendetta politics that they have pursued against our party. We are here to teach them a lesson," a senior TMCP leader of central Kolkata said.
Furious over the attack on BJP party office, BJP national secretary Siddharth Nath Singh alleged law and order in West Bengal had "completely broken down" and the police were acting as "cadres" of the ruling TMC.
"So many of our activists have been injured and police is just a mute spectator. This only shows that the police is acting as cadres of the ruling TMC," Singh said.
The BJP leader met West Bengal Governor K N Tripathi and complained about the incident.