A march in Dublin yesterday by a group associated with the so-called New IRA has been condemned by the Minister for Justice and the Minister of State with Responsibility for Defence.
Members of Saoradh took part in a march on O'Connell Street in Dublin yesterday afternoon.
In a statement, Minister for Justice Charlie Flanagan said he found the displays "very disturbing".
"I know that all right-thinking members of the public are sickened at the sight of a small number of people in paramilitary uniforms, particularly after the horrific killing of a young journalist, Lyra McKee, in Derry on Thursday night," he said.
"These demonstrators do not represent the views of the Irish people who have been united for many decades in rejecting paramilitarism and are rightly revulsed at this display."
Gardaí have confirmed they were not given advance notice of the march.
In a statement, An Garda Síochána confirmed that there is no statutory permit or licence required for groups to assemble in public places.
"An Garda Síochána would ask those planning any public assembly to contact and liaise with local gardaí in advance. There was no prior contact in relation to this march."
The statement added that despite the absence of prior notice, gardaí were aware of the march and "appropriate policing arrangements were put in place."
No incidents were reported to officers during or following the march.
Mr Flanagan said gardaí policed the event "appropriately and with restraint in the circumstances".
The Minister of State with Responsibility for Defence said these people were purporting to be members of some republican army but he said Óglaigh na hÉireann were the real army of the Irish State.
Paul Kehoe described what happened yesterday as "absurd" and said he condemned the march on behalf of the Government.
Mr Kehoe also condemned the murder of Ms McKee and said he does not want to go back to the days when there were killings in Northern Ireland.
He said nobody in Ireland wanted to go back to the "bad old days".
Ms McKee, 29, was shot dead in the Creggan area of Derry on Thursday night.
Two men, aged 18 and 19, were arrested yesterday morning in connection with her death.
Additional reporting Louise Byrne