Farmer leader Rakesh Tikait and others fell as a stage collapsed during an event in Haryana's Jind.
Tikait was attending a 'mahapanchayat' reportedly called by Kandela Khap president Tek Ram Kandela.
A large number of people were seen crowded onstage before the cave-in.
Tikait is one of the leaders of the ongoing farmer protest at Delhi's borders.
His emotional appeal following the Republic Day violence had renewed the stir.
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