Dissident republicans making threats against Irish citizens serving in the British army face "the full rigours of the law", Justice Minister Alan Shatter has said.
Following reports of Continuity IRA supporters issuing the threat at a commemoration in Limerick, Garda Commissioner Martin Callinan reported details to Government.
Mr Shatter declined to comment on the specifics of what was said but a statement from the Department of Justice warned action would be taken.
"The minister has consistently made clear that threats made by and activities of criminal terrorist groups are completely unacceptable and will be met with the full rigours of the law," it said.
Mr Shatter said the commissioner assured him the incident at the Sean South commemoration in the city is being fully investigated.
A small group of Republican Sinn Fein supporters, including men dressed in army fatigues and dark glasses, paraded through the city on Sunday before the event.
A threatening graveside oration reportedly warned Irish citizens in the British army they were considered so-called "legitimate targets".
The event, organised by Republican Sinn Fein, took place at the republican plot at Mount Saint Lawrence cemetery in Limerick city.
A plot to murder a soldier on a Christmas visit home to the city was foiled several weeks ago.