Kumar visited the CPI-M party office and met party district secretary P Mohanan.
He wanted all fronts and parties, which believe in democracy, to raise their voice against the attack.
Some persons had hurled bombs at the CPI-M district office in the city early today.
CPI-M had alleged that BJP-RSS was behind the attack.
CPI-M observed a hartal in Kozhikode as a mark of protest against the attack.
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