COPENHAGEN, Sept 24 (Reuters) - Denmark's Aalborg

airport is currently closed due to drones in its airspace, a

spokesperson for the airport said late on Wednesday, two days

after the country's main Copenhagen airport was shut over drone

sightings that rattled European aviation.

Denmark said on Tuesday that the drones that halted flights

at Copenhagen airport for four hours were the most serious

attack yet on its critical infrastructure and linked them to a

series of suspected Russian drone incursions and other

disruptions across Europe.

Authorities in Norway also shut the airspace at Oslo

airport for three hours on Monday evening after a drone was

seen.

Norwegian and Danish authorities are in close contact over

the Copenhagen and Oslo incidents 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 0400 GMT on Thursday due to drone

activity in the vicinity.

Police for the Northern Danish city wrote in a post on

social media platform X that drones had been observed near the

airport and they were investigating further on site.

The spokesperson for Aalborg airport declined to comment on

the number of drones in question.

Four flights were affected, he said, including two SAS

planes, one Norwegian and one KLM flight.