Drones have been seen at several locations near critical infrastructure, military and civilian. These are threats that we can expect to see more of, says Frederiksen in a video call.
The purpose is to confuse and create uncertainty, she continues.
And it comes from a cowardly enemy who does not dare to show themselves.
At a press conference earlier on Thursday evening, authorities noted that it is not clear where the drones come from.
We have no information that points to who is behind this, said Finn Borch, head of the Danish Security and Intelligence Service PET.
They may have come from far away or from very close by. We have not established any hypothesis, added National Police Commissioner Thorkild Fogde.
Ships are part of the investigation
However, Danish Ekstra Bladet reported on Thursday that a Russian warship was located 12 kilometers from the Danish island of Langeland in connection with the drone activity.
Fogde said that shipping is part of the authorities' investigation. To a direct question about whether the mentioned ship is part of the investigation, he answered affirmatively.
He further explained why the police have not been able to board any foreign ships.
We do not have sufficient grounds to board foreign ships in Danish waters. There must be a suspicion, he said.
Suspect connection
At the same time, the Danish police suspect that there is a connection between the drone activity that disrupted air traffic in Aalborg on Wednesday and what happened in Copenhagen on Monday, when Kastrup was forced to close due to drone activity.
On Thursday morning, the country's second-largest airport, Billund, was also forced to close its airspace for an hour. Drones have been reported over at least five Danish airports.
But the Danes should not let themselves be intimidated, said Foreign Minister Lars Løkke Rasmussen.
The purpose is to scare us. We should not fall for that. So, therefore: Stay calm and carry on, says Lars Løkke Rasmussen to DR.
Corrected: In an earlier version of the text, an incorrect title for Finn Borch was used.
