Bloody Sunday, Derry, Northern Ireland, 1972 Demonstrations 4 History 4 Political violence 4 Demonstrations -- Northern Ireland -- Derry -- History -- 20th century 2 Derry (Northern Ireland) -- History 2 Massacres 2 more ... Political violence -- Northern Ireland -- Derry -- History -- 20th century 2 Post-traumatic stress disorder 2 Social conditions 2 Bloody Sunday 1 Demonstrations-Northern Ireland-Derry-History-20th century 1 Derry (Northern Ireland) 1 Derry (Northern Ireland) -- Social conditions 1 Derry (Northern Ireland)-History 1 Massacres -- Northern Ireland -- Derry -- History -- 20th century 1 Post-traumatic stress disorder -- Northern Ireland -- Derry 1 less ...