The decision in this regard was taken at an executive meeting here which saw rival groups coming to blows.
Talking to reporters after the heated meeting, NCP State President Uzhavoor Vijayan said in today's executive meeting "we have decided to remain with LDF. We will continue with secular parties".
A faction of the NCP led by MLA Thomas Chandy is against the unit's decision to remain with LDF. Chandy did not attend the meeting as he is outside the country.
The state unit, which met here last month, had decided to ask the leadership to reconsider its decision to support BJP in Maharashtra.
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NCP, a minor partner of the Opposition Left Democratic Front (LDF), has two MLAs.
Thomas Chandy had earlier said the state unit cannot take a stand contrary to the party's decision and those who do not want to toe the party line can leave.
CPI(M) veteran V S Achuthanandan had also resented NCP's decision and said a party which took a stand helpful to the BJP would not have a place in the LDF.