Danish police have detained two brothers from Somalia on suspicion of plotting an attack, the state security police have said.
The Danish Security and Intelligence Service (PET) said in a statement the arrests late on Monday had thwarted a "concrete act of terror," but did not elaborate.
The brothers are aged 18 and 23 and are Danish citizens who have lived in Denmark for 16 years, according to PET.
It said one of the brothers was suspected of being trained at a camp of the militant group al Shabaab in Somalia.
The Duchess of Cornwall will visit the set of crime drama The Killing to see the new series being filmed.
Camilla is understood to have specifically requested the visit to the film set just outside Copenhagen, where she is on the final day of engagements before returning to the UK with the Prince of Wales.