Sussex Police insisted it was not "back to square one" after releasing an arrested man and woman without charge.

It said it was investigating 67 drone sightings but had earlier raised the possibility there may have been no drone at all.

There are quite a few birds of prey that hover then dart off either to ground or to another level before hovering again.

From a considerable distance these birds may have been mistaken for drones.

Apparently none of the police who were called in (or the army) saw any drones.