Flights at Gatwick Airport have been suspended following reports of two drones flying over the airfield.
The airport tweeted it was investigating, and apologised to passengers for the inconvenience, stressing that safety was "our foremost priority".
Gatwick advised anyone flying from the airport, or collecting someone, to check the status of their flight.
Responding to a passenger who complained their plane had been diverted to Stansted, and then Heathrow, British Airways tweeted: "Gatwick have stopped all arrivals and departures due to a drone, we've been told. Something that's not within our control. We hope the crew keeps you updated."
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