The exact nature of the fault isn't known but in a statement, Gatwick Airport said: "Due to an air traffic control systems issue in Gatwick's control tower, flights are now suspended".
The unspecified issues began around 5 p.m., prompting airport officials to cancel 28 flights and divert another 26 to other airports.
Eurocontrol clarified its statement moments later, saying that Gatwick has actually started a "recovery phase, " that is expected to take "some time".
"We are working with ANS, our provider, to rectify this issue as quickly as possible".
The closure lasted for nearly two hours and caused at least two dozen inbound flights to divert to alternate airports.
Delta flight forced to make emergency landing after engine failure
A passenger has filmed the moment that an engine suffered massive failure on a U.S. flight. The passengers eventually landed at around 8:30 p.m. local time.
Britain's second-biggest air hub restarted landings and take-offs around 7pm local time (2am on Thursday, Singapore time) but warned passengers to check flight information with their airlines.
Flights had been suspended after an issue with air traffic control systems in Gatwick's control tower.
In December, flights were suspended for 30 hours after drone sightings, causing chaos for 140,000 passengers.
The airport, the eighth-busiest in Europe, serves numerous low-priced carriers and is EasyJet's biggest hub.
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