Flights at Gatwick Airport have been suspended amid reports of drones being flown over the airfield.
Passengers faced delays and diversions after two of the unmanned devices were spotted near a runway.
Those due to take off said their planes were stuck on the Tarmac, while some due to land at Gatwick said their flights were redirected to airports hundreds of miles away.
The airport warned the disruption could continue into Thursday.
A spokesman confirmed there were no flights in or out of the airport, and that it was working with Sussex Police to investigate the drone sightings.
He apologised for any inconvenience but said safety was Gatwick’s “foremost priority”.
Those heading to the airport to travel or meet relatives have been advised to check the status of their flights first.
Social media users spoke of flights being diverted to other UK airports, including London Heathrow, Luton and Manchester.
Rashna Havewalla said she and her fellow passengers were sat waiting inside their aircraft at Manchester.
While Richard Hargreaves’ easyJet flight was redirected to Birmingham, with those on board waiting to fly back to Gatwick.
British Airways (BA) told one customer who complained via Twitter, that Gatwick had “stopped all arrivals and departures due to a drone”.
One traveller said on social media his BA flight was forced to divert to Stansted.
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