They added that the situation was under control and officers have arrested a 51-year-old British man on suspicion of being behind the threat.
It is understood that the man will be questioned as soon as possible.
Police are investigating a bomb threat made against a Ryanair flight that landed in Oslo, authorities have said.
«The plane has landed safely on the runway,» Norwegian police said in a statement on Friday.
Police said all passengers on the plane had now been evacuated and the aircraft would be examined by emergency authorities.
The plane flew to Oslo Gardermoen Airport, the main international airport in Norway, from London’s Stansted Airport, according to the Danish Defence Command.
Danish F-16 military aircraft scrambled to escort the plane to Norway, the organisation wrote on its Twitter account.
“Crew on a Ryanair flight from London Stansted to Oslo today discovered a note that claimed there was a potential security threat on board,” a Ryanair spokesperson told Reuters.
“The captain followed procedures and continued to Oslo airport where the plane landed safely. Customers remained on board while authorities carried out a security search.”
It is the second bomb threat against a Ryanair plane this week after a flight from Krakow to Dublin was forced to land when a note was discovered claiming there were explosives on board.
Police said nothing suspicious was found when officers carried out checks on the plane and two men were arrested on suspicion of making threats to endanger an aircraft.
The two men, a 26-year-old and 47-year-old, were in custody as of Tuesday afternoon.