The attack outside the BJP headquarters prompted the party's West Bengal president Dilip Ghosh to demand President's Rule in the state with he alleging that law and order had gone for a toss.
Sloganeering, TMC workers allegedly pelted stones at the BJP headquarters around 10.30 am and in the ensuing clash, several people were injured.
"Stones were pelted at our party office and cars parked outside. More than 10 BJP workers suffered severe injuries," Ghosh said.
"Is this democracy? The law and order situation has completely broken down. Only President's Rule can bring back the rule of law in the state," Ghosh said.
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"TMC activists were attacked by the BJP. Our party will never allow a communal force such as the BJP to disturb the peace prevailing in the state," she said.
An hour before this, a clash had occurred between workers of the parties at the Jorabagan area in central Kolkata over a motorcycle rally by the BJP's youth wing to mark the birth anniversary of Swami Vivekanada.
BJP leader and councillor Minadevi Purohit said, "TMC activists attacked our party workers and assaulted them brutally."
The BJYM alleged that they were attacked by TMC "goons" when they were trying to take out a rally from the Jorabagan area.
Local TMC MLA Smita Bakshi denied the allegations and said those "who were trying to gain a foothold in Bengal are behind the violence".
A BJP delegation will meet Governor K N Tripathi this evening and lodge a complaint about the incidents, party sources said.
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