An SAS passenger plane flying from London to Stockholm made an emergency landing in the western Swedish coastal city of Gothenburg on Friday after a bomb threat, police said.
The 72 people on board were evacuated and bomb disposal experts combed the aircraft and passenger luggage for explosives.
The aircraft crew had earlier sounded the alarm with air traffic control, who in turn informed police. It remained unclear where the threat had come from.
All travellers have been identified and investigators have interviewed the crew.
Passengers will only be able to continue their journey once the all-clear is given, police added.
Flights to and from Sweden's second biggest airport were temporarily suspended but air traffic is under way again.