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.
Anti-Social Behaviour Escalating In Midlands
Parts Of Midlands Under Status Yellow Fog Warning
Funeral Arrangements Announced For Woman Killed In Midlands Crash
Garda Commissioner Confident Security Operation For EPC Meeting Will Be A Success
Midlands Gardaí Appeal For Witnesses To Fatal Crash
Midlands Security & Defence Analyst Says Hoax Bomb Threats Aimed To Intimidate
Almost €446,000 Allocated To Midlands Community Centres And Clubhouses