Germany’s Munich airport reopened on Friday after shutting overnight due to drone sightings that forced the cancellation or diversion of dozens of flights on the eve of a national holiday and heightened concerns about the vulnerability of critical infrastructure in Europe.

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 at around 5:25 a.m. (0325 GMT), according to the airport’s website.

The airport said several drone sightings late on Thursday evening had forced air traffic control to suspend operations, leading to the cancellation of 17 flights and disrupting travel for nearly 3,000 pas

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