Exactly a year before Indian independence there were deadly riots in India's second city of Calcutta. They followed mass demonstrations calling for the creation of a Muslim-majority state and persuaded many political leaders that India should be divided on its independence. Thousands of people were killed and thousands more left the city. Justin Rowlatt has been speaking to 2 survivors of the killings.Photo: Calcutta policemen use tear gas during the communal riots in the city. (Credit: Keystone Features/Getty Images)