Senior Bharatiya Janata Party leader and party's candidate for Karimpur assembly bypoll Jay Prakash Majumdar was on Monday allegedly beaten up by Trinamool Congress activists at Phipulkhola area of Nadia district when he was entering a polling booth.
TV footage showed Majumdar being beaten up and kicked by some people.
Holding TMC "goons" responsible for the act, he said, wounds will heal but the incident is a "clear" sign of the "end of democracy" in West Bengal.
The BJP leader alleged that the TMC activists were false voters who had assembled in the area with the intention of rigging polls.
"But it will not demoralise me and I will continue to visit all the booths. I have complained to the Election Commission," Majumdar, the vice president of the state unit of the BJP, said.
Denying the allegations as "baseless", the Nadia district unit of the TMC said, locals had attacked Majumdar as they were angry with him for "vitiating" the poll atmosphere.
WATCH: WB BJP leader kicked, thrown into ditch
The EC has sought reports about the incident.
TMC MP Mahua Moitra declined to comment.
The BJP on Monday described the assault as "murder of democracy" while the ruling Trinamool Congress claimed that the saffron party has orchestrated a drama to gain the sympathy of voters.
"Our candidate Joyprakash Majumdar was attacked by Trinamool Congress workers. It is the murder of democracy under the chief ministership of Mamata Banerjee. The TMC has resorted to violence anticipating defeat in the polls," senior BJP leader Mukul Roy said.
"This is unprecedented and had never happened even during the 34 years of Left Front misrule," he claimed.
