COPENHAGEN, Denmark (AP) — Denmark’s defense ministry said Sunday that it had again observed drones at several of its armed forces’ locations overnight, a day after the NATO alliance announced that it would enhance its vigilance in the Baltic Sea region.

The ministry said in a statement that it had “several capacities deployed” after drone sightings from Saturday into Sunday night. It didn’t offer any further details about the specifics of the deployment, the number of drones or locations.

This is the latest unexplained drone activity after several sightings, including over five Danish airports last week, raising concerns about security in northern Europe amid suspected growing Russian aggression .

Following a NATO meeting in Riga, Latvia, on Saturday, Col. Martin O’Donnell, the Supreme

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