Munich airport was forced to close on Thursday evening after several drones were spotted hovering over the travel hub. Federal police confirmed the drone sightings, but said no information on the type and size of the devices could be provided. According to local reports, the first drones were spotted at around 9.30pm on Thursday and reported to police. Authorities in Germany have urged caution about reading too much into drone sightings. The drones that flew over Denmark 'show we need pre-alert systems, and we need to cooperate,' France's Macron said in Copenhagen.