Against a backdrop of communal tension , the protest triggered massive riots in Calcutta . More than 4,000 people lost their lives and 100,000 residents were left homeless in Calcutta within 72 hours . This violence sparked off further religious riots in the surrounding regions of Noakhali , Bihar , United Provinces ( modern Uttar Pradesh ) , Punjab , and the North Western Frontier Province . These events sowed the seeds for the eventual Partition of India
Noakhali
Noakhali riots
Direct Action Day