United Airlines Flights 971 made an emergency landing in Shannon, Ireland on Monday.
A Garda spokesperson also told the Independent.ie that the flight was diverted following "the discovery of a note relating to a bomb threat on board".
Passengers were eventually permitted to leave the plane and were taken to a terminal where their luggage underwent security screening.
United said in a statement that the landing was due to "a potential security concern" but declined to comment further.
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The Irish Times reported, without citing its source, that a message had been discovered in the plane's toilet claiming that there was a bomb on board. Handwriting on the note was reportedly being analysed to see if it matched with similar threatening notes found on other airplanes, according to Reuters.
"We will work to get customers on their way to Chicago as quickly as possible", the company said.
United Airlines has canceled the final leg of the trip to Chicago and is working to find flights to Chicago for its stranded passengers.
Passengers are now being investigated with police taking writing samples from all those on board.