The men were detained in Limerick and Portlaoise this morning.
Two men have been arrested and charged in connection with an investigation in to cross border terrorism.
The men - both aged in their 30's - were detained in Portlaoise and Limerick this morning.
They're due before Portlaoise District Court later today.
Gardai say 2 other men already charged in connection with the investigation are also facing further charges and will also be brought before Portlaoise District Court in the coming hours.
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