In a communication, the Union Home Ministry asked the state government to provide details of the incident and action taken on it, official sources said.
The Centre's missive came hours after Home Minister Rajnath Singh spoke to Kerala Chief Minister, expressing concern over the Tuesday night's incident.
No one was injured in the incident which occurred around midnight shortly after BJP state president Kummanam Rajasekharan had left the office for Kozhikode, where preparations are on for a three-day National Executive and Council meeting from September 23.
CPI(M) has denied BJP's charge and condemned the attack and wanted the government to arrest the "anti-social" elements behind the attack.
The incident comes close on the heels of a series of sporadic clashes between CPI(M) and BJP workers in the past few months in Kerala's northern Kannur district.
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