Gatwick Airport reopened on 21 December, after drones caused it to shut down for 40 hours. Thousands of passengers remain stranded, while police have not yet found the operator, who could be an environmental activist. The airport could not operate while the drones were in flight in case they hit and damaged a plane. There is no evidence at present that the disruption was terror-related. Transport secretary Chris Grayling said the situation was unprecedented, and ‘lessons need to be learned’. In 2013 there were no incidents involving drones, whereas in 2018 there have been well over 100. In June a drone came within ten feet of a Virgin Airways plane carrying 260 people. Mr Grayling said the Government was looking to go further with drone control, including considering age-limits for users.