According to the latest news the drone was imaginary. >>
The 47-year-old man and 54-year-old woman, from Crawley, West Sussex, had been arrested on Friday night.
Their release came as Sussex Police said they were relying on eye witnesses and there may have been no "genuine drone activity in the first place".
Det Ch Supt Jason Tingley said no footage of a drone had been obtained.
He said there was "always a possibility" the reported sightings of drones were mistaken.