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Scores of people fell into a fast-flowing river about 20 miles (30 kilometres) from the hill town of Darjeeling when the walkway broke apart on Saturday night at an event organised by the local Gorkha Janmukti Morcha party.
A steel cable of the bridge snapped as crowds clamoured for a view of speeches and a cultural programme during the five-day festival in Bijanbari town in the state of West Bengal.
"The toll in the collapse has risen to 32. But figures may go up as we have reports that some people are still missing," Darjeeling district magistrate Soumitra Mohan said.
Some local media reports said the bridge had been weakened by an earthquake last month.