Nalini, who was jailed for the assassination of Rajiv Gandhi, interacts with her Sri Lankan husband Murugan, as he is shifted to a Sri Lankan refugee camp in Vellore on Saturday. AFP
Gandhi, 46, was killed by a woman suicide bomber at an election rally in the southern state of Tamil Nadu in a plot by the Liberation Tigers of Tamil Eelam (LTTE), a Sri Lankan armed separatist group.
India's apex court allowed the release of the six convicts, citing their "satisfactory conduct" in prison and the fact that they had already served over three decades behind bars.
Three of the six — Nalini Sriharan, her husband Murugan, and Santhan — walked out of two prisons in Vellore, about 140 kilometres from the regional capital Chennai, according to an AFP journalist at the scene.
Santhan and Murugan were driven away to a camp for Sri Lankan refugees soon after their release.
Nalini (C), who was jailed for the assassination of Rajiv Gandh, walks out from Vellore women central prison. AFP
Local media said the others — Robert Pais, Jaikumar and Ravichandran — walked out of prisons in Chennai and the city of Madurai in the same state.
Three of the six convicts released on Saturday had initially been condemned to death before their sentences were commuted.
Gandhi became India's youngest prime minister after his mother and predecessor Indira Gandhi was assassinated by her Sikh bodyguards in 1984.
The family's Congress party dominated Indian politics for decades, and Rajiv's widow Sonia remains the organisation's most powerful figure, while their son Rahul, 52, is seen as the main challenger to Prime Minister Narendra Modi.
Rajiv's killing was seen as a response to his move to send Indian forces to Sri Lanka in 1987 to disarm the Tamil rebels. New Delhi lost more than 1,000 men against the well entrenched rebels before it withdrew its troops.
The Congress party has condemned the court's decision as "totally unacceptable" and "completely erroneous."
"It is most unfortunate that the Supreme Court has not acted in consonance with the spirit of India on this issue," the party said, tweeting a statement by senior member Jairam Ramesh.
Gandhi's son has over the years spoken about how he and his sister Priyanka had forgiven their father's killers.
"We were very upset and hurt and for many years we were quite angry," the Indian Express newspaper quoted Rahul as saying in 2018. But they had since forgiven them, he said, "in fact, completely."
The release of the convicts has been the subject of much debate in India, and Congress condemned the court decision as "totally unacceptable" and "completely erroneous."
Gandhi, who arrived in Kathmandu on Monday evening to attend a wedding of his Nepalese friend, Sumnima Udas, had previously stayed at a five-star hotel in Kathmandu.
India's main opposition leader Rahul Gandhi was restored to parliament on Monday after the Supreme Court last week suspended his defamation conviction over comments criticising Prime Minister Narendra Modi.
Some 104,000 people, including technical and security staff, have access this year to the "blue zone" dedicated to the actual climate negotiations and the pavilions of the states and organisations present.
This came during the COP28 Conference of the Parties, which was hosted by the UAE in Expo City Dubai, and its activities began on Thursday and will continue until December 12.
"India is committed to UN Framework for Climate Change and that is why I propose from this stage that COP33 Summit in 2028 be hosted in India," Modi said during his speech at the COP28 summit in Dubai.