A faulty fire alarm is being blamed for triggering an evacuation of the terminal building at Shannon Airport this morning.
A spokesperson said the alarm went off at around 8.15am and the building had to be cleared for about ten minutes.
She said there was no impact on flights and passengers were soon allowed back inside.
Meanwhile, two transatlantic flights were diverted to Shannon as a result of medical emergencies.
Canadian airline Westjet, which was en route from Gatwick to St Johns in Newfoundland, landed at Shannon after the pilot declared a medical emergency.
The Boeing 737-700 landed just before midday and a passenger was taken to hospital.
Separately, a Delta Airlines passenger plane, which was en route Paris to Minneapolis, also diverted to Shannon after a passenger became unwell.