The police statement comes after last week, the UK police said the New Irish Republican Army (IRA), a breakaway group from the original IRA, which was linked to years of terrorism in Northern Ireland, claimed responsibility for sending five suspected explosive devices in packages to a number of homes across the United Kingdom.
Detectives investigating small improvised explosive devices that were received at locations in London and Glasgow on 5 and 6 March are now linking a fifth device found today, 22 March at a postal depot in Limerick, Republic of Ireland.
Police believe it's linked to a number of similar devices sent to locations in the United Kingdom earlier this month.
Packages were sent to transport hubs in the British capital, as well as Glasgow University, earlier this month.
Mr Flanagan said the item found in Limerick could be the fifth.
Emergency services were called to incidents at Heathrow Airport, London City Airport and Waterloo train station.
One of the packages was found at Waterloo station in London
The senders' addresses were given as Dublin, with two having added coach operator Bus Eireann. One sent to the The Compass Centre in Hounslow in London partially ignited after being opened by staff.
Gardai say the suspect package found in Limerick this morning appears to be identical to those sent to the United Kingdom earlier this month.
An Garda Síochána have said they continue to liaise with the United Kingdom authorities in relation to these investigations.
He said: "First of all I condemn the actions of whoever did this without reservation, no matter what is happening in politics at the moment, it's no justification for violence and certainly no justification for potentially exposing civilians to injury or potentially death".
The Justice Minister has said there's reason to believe it could be linked to the recent letter bombs in the UK.
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