sighting

Drone sightings also caused air traffic to be halted twice late on Tuesday after drones were spotted near the same airport in Brussels, as well as at another in Liege.

There was a sharp rise in reported UFO sightings.

An Orange County park was temporarily shut down Tuesday after two people reported mountain lion sightings the day before.

Defence Minister Theo Francken earlier refused to point the finger at Russia for the weekend sightings near the base, but said that they appeared to be a coordinated operation carried out by "professionals".

Suspected drone sightings have disrupted flights at airports across Belgium on Tuesday, with no flights departing or arriving at Brussels Airport - the country's busiest.