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.
The 207 passengers and 11 crew members disembarked from the Boeing 767-330 at Shannon Airport at 2.15pm, according to Jim Molloy, a representative of Ireland's police force.
The passengers of flight UA971 were in the process of being searched, he said in an emailed statement, but gave no further details about the nature of the threat.
United said in a statement that the landing was due to "a potential security concern," but declined to comment further.
"After assessing the situation, our crew made the decision to divert to the nearest available airport," it said. "Additional security screenings will be performed on all customers and baggage."
The airline said on Twitter that the flight was now cancelled and would depart for Chicago on Tuesday.
The US government was aware of the incident and seeking to establish whether there was any violent intent behind the threat.
A second US government source said similar incidents involving threatening notes found on aeroplanes happen about once a week.
The handwriting on the note was being analysed to see if it matched with any other such notes, which are periodically found on aircraft, one of the sources said. It was not clear whether the note was posted in the bathroom prior to takeoff or during the flight.
Police were also taking handwriting samples from the passengers, the Irish Times reported. The message was found in the plane toilet, it said, without citing sources.
The United jet completed its descent after jettisoning some of the fuel loaded for its transatlantic crossing, according to recordings on air traffic control site LiveATC.net.
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