Gatwick's South Terminal is experiencing delays following a power outage.
Passengers are being told to check the status of their flights after an outage affected check-in and baggage systems and some parts of the departure lounge.
The airport is currently looking at contingency plans.
According to Sky News, staff are trying to communicate instructions via loud hailers and whiteboards. One report has suggested a server room had flooded and could have caused the outage.
A statement published on the airport's website said: "We are currently experiencing a power outage affecting some operational systems in the South Terminal.
"Unfortunately this is causing some delays for passengers and we apologise for any inconvenience this is causing. We are working to fix the problem and looking at what contingencies we can put in place in the meantime to minimise disruption.
"We advise all passengers scheduled to fly out of the South Terminal today to check the status of the flight with their airline first and check the flight information on our website. We advise passengers to expect some delays."
The airport's Twitter account said: "Staff are currently assisting passengers and we are working to get this resolved."
The power problem followed earlier delays caused by fog at the airport.
EasyJet tweeted advising customers to leave more time to pass through security in North Terminal which they said would be busier than normal following the power cut.
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