"This is a media creation. The party has not received such a letter. This is part of the false propaganda against the party being mounted by the UDF and a section of media," Vijayan told reporters at Kasargod.
Asked whether Achuthanandan himself should not have denied if the report was baseless, Vijayan shot back saying "you should ask this to VS."
Sources close to Achuthanandan had said he had written a letter to Karat, seeking the intervention of the central leadership in the state party affairs.
The long-drawn Vijayan-Achuthanandan feud had flared up a fortnight ago in the wake of the murder of Chandrasekharan, who was expelled from the CPI(M) a few years back and floated the Revolutionary Marxist Party (RMP).
While CPI(M) is under shadow of suspicion with the arrest of some party activists in the case, Achuthanandan has kept on saying that the state leadership should have tried to bring back rebels like Chandrasekharan.
While Vijayan dubbed the rebels as "renegades", Achuthanandan took serious objection to that and accused Vijayan of acting like an autocrat.
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Earlier, inaugurating a rally from Trikkarippur near Kasargod in protest against the recent communal clashes in the district, Vijayan alleged that concerted attacks were being carried out against CPI-M cadres and that the ruling United Democratic Front and some extremist elements were also joining it.
"There are attempts to blame CPI(M) for the murder of Revolutionary Marxist Party leader T P Chandrasekharan on May 4," Vijayan alleged.
Chandrasekharan, expelled from CPI(M) a few years back, was attacked and killed by unidentified assailants at Vallikkad near Vatakara in Kozhikode district on May 4.