Mysteries of the Night Sky: Understanding Unidentified Lights

When mysterious orb-like lights were recorded in the sky above Koge, a small port town in Denmark, the UFO scene took notice. But it wasn't just believers who wanted to know what these unidentified flying objects were.

Danish police and the Danish security services describe the objects as large drones - similar to the ones seen on the USA's East Coast before Christmas. But no-one can say who is flying them, or why. Could it be the Russians?

Lucy Proctor meets the people involved in Denmark's unique UFO scene and tries to find out what these drone sightings mean.