Germany's Munich airport restarted flights on Friday after several drone sightings forced its closure overnight, the latest in a string of similar aviation disruptions across Europe. Munich became the latest to close its airspace on Thursday night after several drone sightings, causing more than 30 flights to be cancelled or diverted and leaving nearly 3,000 passengers stranded. "Nineteen Lufthansa flights were affected -- either cancelled or re-routed -- because of the the airport suspension," the spokesperson said. Advertisement AdvertisementAdvertisement AdvertisementThe airport said it had laid on camp beds, blankets, drinks and snacks to affected passengers. - 'Drone wall' -Advertisement AdvertisementAdvertisement AdvertisementThe drone sightings in Denmark and high-profile aerial incursions by Moscow in Estonia and Poland have heightened fears that Russia's assault on Ukraine could spill over Europe's borders.