Authorities flocked to Munich airport overnight following reports of drone sightings. Photo: AP PHOTO

Drone sightings at Germany's Munich airport have led to the cancellation and diversion of dozens of flights on the eve of a national holiday, leaving nearly 3000 passengers stranded, and authorities say they are investigating the incident.

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The overnight disruption is the latest in a series of similar incidents that have rattled European aviation, raising concerns about deniable hybrid attacks on Ukraine's European allies, possibly directed by Russia.

As airport operations resumed e

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