A plane flying from Europe to the United States has been diverted after a cryptic note hinting at a bomb was reportedly found scrawled on the wall in the aircraft's bathroom.
There were 214 passengers and crew on board.
They also confirmed that the plane and all the passengers are now being searched.
Flight 971 was en route from Rome to Chicago when it diverted to Shannon around 1:44 pm local time.
The airline said on Twitter that the flight was now canceled and would depart for Chicago on Tuesday.
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A United Airlines flight from Rome to Chicago has been diverted to Ireland's Shannon Airport after a message perceived as a potential security concern was discovered on board, Irish police and airline officials said.
The message made reference to a bomb on the plane, a source with knowledge of the investigation told Reuters.
A United spokeswoman said on Monday that passengers and baggage would undergo more security screening before the flight resumes.
Gardaí are carrying out examinations of handwriting samples gathered from passengers while all hand luggage has also been screened.