The State also denied making any allegations against the LTTE in its recent petition in the apex court, seeking Central security to the dam.
"An additional petition will be filed in the apex court that Tamil Nadu does not accept an assessment of the Intelligence Bureau with regard to the LTTE," Tamil Nadu Finance and PWD Minister O Panneerselvam said here.
In a recent plea in the Supreme Court, Tamil Nadu had cited an Intelligence Bureau report of September 2014 to strengthen its request for Central security to the dam.
The IB report referred to vulnerability and threats from "Islamist terror outfits, remnant cadres of LTTE and Naxals" and had advised precautionary measures.
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"Even the IB did not specifically say that LTTE (remnants) will cause damage to the dam," he said.
"This has however led to unnecessary debates and bitterness."
"Since Amma's regime which is supportive of Sri Lankan Tamils is blamed, an additional petition will be filed in the Supreme Court on the advice of Chief Minister Jayalalithaa," he added.
In the recent petition, Tamil Nadu had only brought to notice that the Intelligence Bureau had strongly recommended replacement of the Kerala Police with that of CISF or CRPF to guard the dam, he pointed out.