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V Murugan alias Sriharan, S Jeyakumar and B Robert Payas left by a Sri Lankan carrier for Colombo.
Members from the 122 Infantry Battalion meet for the first time after 33 years.
Nedumaran, who was speaking to reporters in Thanjavur, said that the outlawed leader will appear in public at the right time.
The development came following a Supreme Court order setting all six free. They were serving life term for about three decades.
The NIA registered the case after intelligence inputs regarding former members of the Liberation Tigers of Tamil Eelam trying to raise funds to support the activities of the now-defunct movement in Tamil Nadu.
Satkunam alias Sabesan, 47, a Sri Lankan national and a former member of the intelligence wing of the LTTE, was arrested by the NIA on Tuesday, the official of the premier investigation agency said.
If Sri Lanka manages to strengthen the reconciliation process in a visible manner and improves the deteriorating humanitarian situation in the last two years, it can gradually avoid a severe international investigation into violation of human rights.
The LTTE's continued violent and disruptive activities are prejudicial to the integrity and sovereignty of India, a statement from Home Ministry read.
The ex-soldier, Thulasidharan, has been living with the leftovers of metal pieces that pierced his body after a mine blast 30 years ago.
At least 14 of the skeletal remains found in the northeastern district of Mannar were of children.