"It is very sad and it has to be condemned by one and all, not only in Kerala but everywhere in the country," the Union Science and Technology Minister said, reacting to the incident which occurred on Tuesday night in the state capital.
The BJP state unit has alleged that the CPI(M) workers were behind the attack.
"Ideological fight should be of ideology. It should not be a physical fight," Harsh Vardhan, who is also a senior BJP leader, said on the sidelines of a function organised at Ponkunnam in the district.
No one was injured in the incident which occurred shortly after BJP state president Kummanam Rajasekharan had left the office for Kozhikode, where preparations are on for the three-day National Executive and Council meeting from September 23 which is being attended by senior party leaders and Prime Minister Narendra Modi.
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When asked how the central leadership viewed the development in the state, he said what he expressed was "a universal sentiment and this can't be different of different people at different levels."
Rajasekharan has alleged that CPI(M), the lead partner of the ruling LDF in Kerala, had taken law into its hands and police was a "mere spectator".