Gatwick Airport has temporarily suspended flights after another suspected drone sighting on Friday evening.
The runway had earlier re-opened for a “limited” number of arrivals and departures as police said they had identified “a number of persons of interest”.
Bosses have warned that passengers should still check with their airlines as to the status of their flight, and some people are being moved to other airports because of the disruption.
Police hunting the drone operator said there had been more than 50 sightings of the craft in the 24 hours from 9pm on Wednesday, when Gatwick was first forced to close. But the culprit has yet to be found and senior officers said shooting down the drones was being considered.