Normal operations have since resumed.
Terminal 2 in Dublin Airport was briefly evacuated after an alarm went off on the premises this morning.
https://twitter.com/DublinAirport/status/679589612386414592
An official explanation has yet to be offered as to why the alarm went off, but it is believed to have been caused by someone smoking in the toilets.
https://twitter.com/DarrenGale_1/status/679590601747251200
https://twitter.com/TodayFMNews/status/679592185642283009
https://twitter.com/KeithStephens/status/679591727494250496
Following a brief evacuation, normal service has since resumed.