Lines of inquiry include environmental activism and “high-end criminal behaviour”, police say.
Police hunting those responsible for the Gatwick drones chaos have identified “persons of interest”, the BBC understands.
The UK’s second busiest airport has reopened after drones flying over the airfield closed it for more than a day.
Police are exploring “a number of lines of inquiry”, including environmental activism and “high-end criminal behaviour”.
Officers are focusing on “likely locations in and around the airport”.
They said there was “no evidence” the use of the drones was state-sponsored.
Gatwick’s runway reopened Friday morning and 837 flights were scheduled, but there were still delays and cancellations.
Thousands of passengers – including some attending funerals, honeymoons and Christmas reunions with their families – remain stranded at Gatwick.
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