Police officers dealt with an incident at Gatwick Airport this morning (Saturday, December 7).
In a statement just before midday, Sussex Police said officers were at the airport since 11.20am.
A spokesman said: "We can confirm we are in the process of dealing with an incident.
"We cannot divulge any further details at this time."
Inbound flights were diverted and outbound flights were held for around half an hour.
Passengers on board an Easyjet flight have reported details on social media.
Joel Smith wrote: "Gatwick Airport stopped. Just landed but stuck on tarmac. Flight captain says 'due to a security threat made towards aviation'.
"Emergency services currently checking aircraft."
Another eye witness account said the plane was held 'for a short time' before being allowed 'off the runway'.