An elderly woman has been arrested after the flight on which she was travelling was forced to divert to Shannon Airport this evening.
It is understood the woman, believed to be in her 80s, became disruptive on board the transatlantic jet and at least one cabin crew member was assaulted.
Gardaí and airport police officers were waiting for Air Canada flight ACA-877 when it landed at Shannon at around 8.15pm.
The Boeing 777-300 jet was over 1,000km north west of Shannon when the crew opted to turn around.
The flight was on its way from Frankfurt in Germany to Toronto in Canada at the time.
The woman has been taken to Shannon garda station, where she is expected to be interviewed.
It is understood she had to be restrained by members of the cabin crew, at least one of whom is reported to have been scratched.
Gardaí at Shannon are investigating the incident.