Gardaí believe they have foiled a Real IRA bomb plot aimed at disrupting the 24 November deadline for parties to reach agreement in Northern Ireland.
A large amount of explosives were found in Kilbranish, Mount Leinster, Co Carlow last night.
Gardaí requested an Army EOD team last night but because of darkness the team did not go to the scene until this morning.
An Army team disabled the device safely at 9.30am this morning.
A Defence Forces spokesman said the devices consisted of a gas cylinder packed with powdered explosives from shotgun pellets mixed with petrol.
It is believed the Real IRA were testing bombs in the area.