Governor K Rosiah and Chief Minister Jayalalithaa administered the anti-terrorism day pledge at Raj Bhavan and State Secretariat in Chennai, respectively.
They also paid floral tributes to the portrait of Gandhi, who was assassinated this day in 1991 by a human bomb at the nearby Sriperumbudur.
Meanwhile, Congress supporters paid tributes at the leader's memorial at nearby Sriperumbudur where he was assassinated by a human bomb in 1991 during an election rally.
A Sadbhavana Jyoti, which commenced from Bangalore before proceeding to Kerala and Puducherry, culminated at the memorial, AICC secretary P Sudhakar Reddy said.
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Floral tributes were also paid to the leader at the TNCC headquarters here.
In neighbouring Puducherry, Chief Minister N Rangasamy led the Union Territory in paying homage to the former Prime Minister. He also administered the 'anti-terrorism' pledge.
Earlier, in the PCC office, Minister of State in PMO V Narayanasamy, PCC leader A V Subramanian, leader of the opposition V Vaithilingam and host of other Congress leaders paid floral tributes to the portrait of Gandhi.
Later Narayanasamy headed a padayatra from the party office to Thattanchavady, covering a distance of four km, to garland a statue of Rajiv Gandhi and also to flag-off a motorcycle procession by volunteers of the youth congress proceeding to Sriperumbudur.