The terminal was evacuated as a "precautionary measure", BBC reported.
Passengers were allowed to re-enter and flights are expected to resume shortly.
There may be some disruption for the remainder of the day, the DAA said.
Gardaí (Irish police) remain at the scene.
Traffic remains heavy on routes to the airport.
Separately, a Europe-wide software issue is causing minor issues at some airports airports, including Dublin and Cork.
MNA
Your Comment