COPENHAGEN (Reuters) -Denmark’s second-biggest airport, Billund, was briefly shut early on Friday following a report of illegal drone activity that police later identified as “a shining star in the sky,” amid heightened concern over drone sightings nationwide.

The country has had a wave of reported sightings this week, with police confirming on Friday that more than 500 possible drones had been spotted within the last 24 hours.

The incidents follow Monday evening’s closure of Copenhagen Airport, Scandinavia’s largest, due to drones in what Prime Minister Mette Frederiksen called “the most serious attack on Danish critical infrastructure to date.”

Drones were subsequently spotted at Aalborg, Esbjerg and Sonderborg airports and at the Skrydstrup air base, leaving authorities scrambling to

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