A British soldier drags a Catholic protester during the "Bloody Sunday" killings when British paratroopers shot dead 13 Catholics civil rights marchers in Londonderry. AFP 
A British soldier drags a Catholic protester during the "Bloody Sunday" killings when British paratroopers shot dead 13 Catholics civil rights marchers in Londonderry. AFP 

Northern Ireland marks 50 years since the start of The Troubles