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

Germany's Munich airport has reopened after shutting due to drone sightings that forced the cancellation or diversion of dozens of flights and heightened concerns about the vulnerability of critical infrastructure in Europe.

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As operations resumed early on Friday morning, a Reuters witness saw passengers checking in for a flight to Varna in Bulgaria, and the departure board showed only a few flights had been cancelled.

A flight from Bangkok was the first of the day to land after 5am

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