Before partition of Bengal, Kolkata had offered education and job opportunities to the people from East Bengal. Kolkata had taken in about a quarter of a million East Bengali migrants long before partition. After partition of Bengal, the number of refugees moving in from East Bengal were so high that large stretches of rural or semi urban habitation were transformed into towns, the density of population, particularly in areas with high refugee population, jumped by leaps. The outer limits of Kolkata were extended. The entire process of urbanisation was hastened. In the fifties 25% of the population of Metropolitan Kolkata were refugees. In 1975, a CMDA report suggested that there were 1,104 squatter colonies in West Bengal, out of which 510 were in Calcutta Metropolitan District. In 1981, a refugee rehabilitation committee set up by the state government put the figures for refugees in the state at 8 million. The break up for Kolkata is not available. The central government had decided that 25 March 1971 was the cut off date for entry of refugees from former East Pakistan into India and so, all those coming in after that date are either immigrants or infiltrators – there were no more refugees, at least officially/legally.