Army bomb experts have made safe a viable device containing over 40kg of homemade explosive material after a two-day security alert in Lurgan.
And a second explosive device has been found inside a vehicle at the long-stay car park at Belfast International airport.
Assistant Chief Constable Duncan McCausland said both devices “had the potential to cause injury and damage”.
“They were left in places used by the public and with no regard for the public; it is thanks to the vigilance of individuals that no serious harm has been done,” he said.
“In recent days police have stepped up their measures to counter the threat posed by misguided individuals and groups who seek to drag the country back to mayhem and misery.
“Our efforts will continue and we would ask everyone in the community to be vigilant about their surroundings as they go about their daily business.”