A Ryanair flight from Oslo to Manchester was evacuated after two passengers were thought to have used the word "bomb" in a heated conversation.
Police swooped as passengers boarded the aircraft at Rygge airport on Sunday evening due to "suspicious behaviour" of two on board.
The incident came hours after a fake bomb left by a security company was found at Old Trafford, causing Manchester United's final game of the season against Bournemouth AFC to be postponed.
A Ryanair spokesman told the BBC the evacuation in Oslo was due to a "hoax security alert".
The two passengers were taken for questioning and a bomb squad searched the aircraft but found nothing suspicious.
Police spokesman Anders Stroemsaether told a Norwegian public broadcaster that the incident began before boarding when two foreign passengers were overheard arguing in an airport toilet.
Other passengers heard the word "bomb" being used and told the captain as they boarded the aircraft. The two passengers were interviewed and later released.
"After questioning of witnesses and those brought in, the police have concluded that the situation is a result of a misunderstanding," police said.
Ryanair put on a replacement flight from Rygge to Manchester at midnight on Sunday.