Northern Ireland's Protestant first minister called on Friday for the Irish government to apologise for its role in the emergence of the Irish Republican Army in the 1970s.
The Irish government never backed the paramilitary tactics of the Provisional IRA, but pro-British unionists accuse it of failing to crack down on the group's activity in the Republic of Ireland in the decades before its ceasefire in 1997.
"There is a clear connection between what the IRA did in its infancy and the government of the Irish Republic," First Minister Peter Robinson, head of the Democratic Unionist Party (DUP), said in an interview with the BBC.
"I think the Irish Republic would do well to look at its role and recognise that it was not the way it should have behaved in those days, and apologise for it because massive death and destruction followed," he said.
Relations between London and Dublin have improved sharply in recent years, but some hostility remains between the leadership of the unionist community and the Irish government.
A 1998 peace agreement paved the way for the disbandment of the IRA and a compulsory power-sharing government of unionists and pro-Irish nationalists after a conflict that killed around 3,600 people, many killed by the IRA - known as the Provisional IRA to distinguish it from an earlier Dublin-based group.
The peace deal mostly ended the cycle of violence, though some small armed groups remain and street violence occasionally breaks out between members of the two communities.
The DUP said in a statement that it would put forward a motion in Northern Ireland's regional administration on Monday to ask for an apology from the Irish government.
Robinson, whose party shares power with Sinn Fein, the former political wing of the IRA, made his call after relatives of a notorious IRA attack asked the Irish Prime Minister Enda Kenny to apologise for not doing more to solve the crime.
Relatives of 10 Protestant textile workers killed in 1976 near the Northern Ireland village of Kingsmills, county Armagh, met Kenny on Thursday, but said he told them he could not apologise for the actions of the IRA.
Kenny said in a statement that he told the victims' relatives that the IRA were the "common enemy of all of the people of Ireland". The statement did not mention an apology.
A government spokeswoman said she did not immediately have anything to add to the statement.
Mikhail Gorbachev hit with 5-year ban for support of Crimea annexation by Russia
Slovakian Prime Minister Robert Fico says he will continue to oppose an EU quota plan regarding migrants
Donald Trump reached the number of delegates needed to clinch the Republican nomination for president on Thursday,
'In all touristic towns, there is a slight recovery,' tourism minister says
German chancellor says canceling sanction against Russia may harm the G7's credibility
European Commission head warns a G7 summit with politicians such as Trump, Le Pen, Boris Johnson, Beppe Grillo would be 'a horror scenario that shows well why it is worth fighting populism'
US president believes the armed group's violence will continue despite new leadership
'If he meant returning Donbas for humanitarian reasons, this statement can be supported,' Kremlin spokesman says
Foreign Minister Lavrov says 'it is in the interests of Islam to ensure unity of all its branches'
If he succeeds Ban Ki-moon in January 2017, Lancak would be the first Easter European UN chief
Turkish TIKA agency reveals support for over 2,000 people fleeing Boko Haram insurgency
'Food supplies are limited and tightly controlled; medicines are exhausted and many families have no choice but to rely on dirty and unsafe water sources' in the ISIL-occupied city
'A rightful position of the Old Continent in the new international realities can only be secured by combining capacities of all European countries, including Russia,' Russian presdient says
Unless new economic resources are found, economic growth will stay near zero percent, warns Russian president
France hit with numerous workers strikes, are now dipping into its strategic oil reserves due to blockades at refineries with nuclear power workers threatened to join gathering protests against a labour law reform.
Anastasiades cancelled scheduled peace talks and cut short a visit to Turkey on Tuesday after a United Nations summit treated the rival Turkish Cypriot leader as a head of state.