The drones were first sighted at about 9.44pm (Thursday, 3.44am, Singapore time) on Wednesday, according to police, and remained in the airspace at the time of the press briefing at 12.05am on Thursday.
Northern Jutland police said they could not specify the type of drones or whether they were the same as the ones flying over Copenhagen airport on Monday.
“It is too early to say what the goal of the drones is and who is the actor behind,” a police official said.
Norwegian and Danish authorities are in close contact over the Copenhagen and Oslo incidents on Monday, but their investigation has not yet established a connection, Norway’s foreign minister said on Wednesday.
Eurocontrol, which oversees European air traffic control, said arrivals and departures at Aalborg airport would be at a “zero rate” until 4am GMT on Thursday due to drone activity in the vicinity.
Police said they were investigating further on site, and there was no danger to passengers at the airport or residents in the area.
They added that three flights had been diverted to other airports.
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