The content of the letter targeting Chandy for the poor performance of UDF in the recent civic polls had triggered a row after it was reported in the media in the past two days.
As Chennithala had made it clear that he had not sent such a letter and was of the opinion that it was a concocted one, Kerala Pradesh Congress Committee (KPCC) urged the government to order a probe to find the source of the letter.
"It is for the government to decide on the mode of investigation," Sudheeran said.
Both Chandy and Chennithala were present when the matter was discussed, he added.
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The KPCC chief said that the unit has accepted the denial of Chennithala on its face value.
"However, the party looks at it (the issue) very seriously as it is connected with state Home Minister. So a probe is necessary. The probe is to find out whether the letter is a forged one, if forged, who did it and source of the same," Sudheeran said.
The letter also sought the high command's intervention to chalk out a "proper strategy without further delay".
It further stated that the state's Hindu community had got alienated from the UDF due to "dominance of the minority community in the government". The letter had also mentioned about the growth of BJP in the state.
Sudheeran said KPCC executive also passed a resolution condemning BJP led NDA government's attempt to implicate Congress President Sonia Gandhi and Vice-President Rahul Gandhi in the National Herald case.
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On other matters discussed at the executive meet,
Sudheeran said KPCC wanted the Centre to take urgent steps to help rubber farmers in the state who were reeling under a financial crisis due to sharp fall in price of natural rubber in domestic market.
The Centre should ban rubber import and release Rs 500 crore to the state from the Central Agriculture Price Stablisation Fund to ensure reasonable rubber price to farmers, he said.
Similarly, coconut and cardamom farmers in the state were also facing crisis due to fall in prices, he said.