Tens of thousands of Muslims were driven to refugee camps regardless of their political affiliations, and numerous historical sites in Delhi such as the Purana Qila, Idgah, and Nizamuddin were transformed into refugee camps. In fact, many Hindu and Sikh refugees eventually occupied the abandoned houses of Delhi's Muslim inhabitants. At the culmination of the tensions in Delhi, 330,000 Muslims had migrated to Pakistan. The 1951 Census registered a drop of the Muslim population in the city from 33.2% in 1941 to 5.3% in 1951.