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Calcutta had 2,952,142 Hindus, 1,099,562 Muslims, and 12,852 Sikhs in 1946, the year before partition. After independence, the Muslim population came down to 601,817 due to the migration of 500,000 Muslims from Calcutta to East Pakistan after the riot. The 1951 Census of India recorded that 27% of Calcutta's population was East Bengali refugees, mainly Hindu Bengalis. Millions of Bengali Hindus from East Pakistan had taken refuge mainly in the city and a number of estimations shows that around 320,000 Hindus from East Pakistan had migrated to Calcutta alone between 1946–50.[citation needed]