Denmark’s Aalborg airport, which is used for commercial and military flights, was closed due to unidentified drones operating in its airspace, a closure that follows just days after the country’s main Copenhagen airport was forced to shut temporarily due to drone sightings.

Danish police said early on Thursday that “more than one” drone was sighted near Aalborg airport, which is located in northern Denmark, in the Jutland region, and is the country’s fourth-largest city by population.

Police said the drone sightings in Aalborg followed a similar pattern to the drones that halted flights at Copenhagen airport for four hours on Monday, when a number of large and unidentified drones were spotted near what is one of Scandinavia’s busiest airports.

The closure of Aalborg airport affected D

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