A woman walks her dog past an Irish Republican hoarding in the Kilwilkie estate, near Lurgan in Northern Ireland February 27, 2014. Northern Ireland's most senior politician threatened to resign unless there was a full inquiry into guarantees of immunity given by British authorities to paramilitary suspects as part of peace agreements for the province. The issue came to light when an Irishman accused in a 1982 car bombing in London's Hyde Park that killed four soldiers on ceremonial duty walked free on a court finding that he had been given assurances he would not be prosecuted. REUTERS/Cathal McNaughton (NORTHERN IRELAND - Tags: POLITICS CRIME LAW CIVIL UNREST)