The flight from Norway to Manchester was evacuated after reports of two passengers acting suspiciously, according to local reports.
Witnesses have said two “foreign nationals” were seen arguing near a toilet and the word “bomb” was heard, according to Norwegian newspaper Dagbladet.
A police bomb squad is on its way to the airport, according to local media.
The security incident took place at Moss Rygge Airport in Østfold, southeastern Norway.
Operation leader Anders Strømsæther told press outside the airport: “There was an argument was an argument between two foreign nationals in a toilet.
“Witnesses perceived the behavior as suspicious and said the word ‘bomb’ was mentioned.”
Officers are currently searching the aircraft and baggage.
Norway police have confirmed a bomb squad from the capital Oslo is on its way to Rygge to continue the investigation.
The two passengers are currently being held by police.
The details of the flight are unknown, but the only listed flight to Manchester due to leave at 6.55pm (local time) has been delayed.
The Ryanair flight FR3225 is now not due to leave until past midnight.
A Ryanair spokeswoman told Express.co.uk: “This flight from Oslo Rygge to Manchester was delayed ahead of take-off after a hoax security alert.
“Customers disembarked the aircraft and were provided with refreshment vouchers, and will depart to Manchester shortly.
“Ryanair sincerely apologized for any inconvenience caused by this hoax.”
The incident on the Manchester-bound flight comes just hours after Old Trafford was evacuated following a bomb hoax.
Read more: Express