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Londonderry , Northern Ireland . A member of the Royal Ulster Constabulary firing a tear gas pistol at rioters on top of a block of flats in the Bogside area this morning. The riot was sparked off by an Apprentice Boys Parade by 15,000 Protestants to mark the siege of Derry in 1689 . .13th August 1969 (KEYSTONE/United Archives / TopFoto/General)