Nobody has so far confirmed it was drones.
The comapny Copenhagen Airtaxi have confirmed that they were doing trianing flights in that area at the time of the observations. The used a small aircraft Socata TB-20 Trinidad, registration number...
Additional details: Drones over Copenhagen airport....for hours!?
Including elsewhere in the region; someone is have "fun" at the expense of the authorities...
Yup, drones, when misused, can sure create havoc, but when used for good, they are invaluable! BTW, I'm pretty sure Charlie Kirk's assassination could have been prevented if there had been drones surveying the area.