They laid flowers and wreaths at the Rajiv Gandhi memorial 'Vir Bhumi' in New Delhi.
Rahul Gandhi, his son and Vice President of Congress tweeted: "Remembering my father today. A leader driven by love, compassion and a deep generosity of heart. We miss him."
Rajiv Gandhi served as the Prime Minister from October 31, 1984 to December 2, 1989.
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