Sussex Police said it was not terror-related but a "deliberate act" of disruption. Dr Alan McKenna, from the University of Kent, said the drones appeared to be "of an industrial size" not "one you can buy from the shops".
What happened?
The shutdown started just after 21:00 GMT on Wednesday, when two drones were spotted flying "over the perimeter fence and into where the runway operates from".
The runway briefly reopened at 03:01 but was closed again about 45 minutes later amid "a further sighting of drones".
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