A man has now been arrested at Gatwick Airport in London and the north terminal has now been evacuated as a precautionary measure after police found a suspicious item.
Police were called at about 09:30 GMT after “suspicious actions” by a man. A spokesman said Explosive Ordnance Disposal specialists were at the scene.
Gatwick Airport has advised passengers to contact airlines for information.
Sussex Police said the man was arrested after he “discarded an item” at the airport.
Det Supt Nick May said: “At this time, we are investigating the circumstances of the incident and it is too early to say what the item may be.
“However, given the events in Paris on Friday evening, there is heightened awareness around any such incident and it is best that we treat the matter in all seriousness.”
British Airways and Easyjet said they were working with the airport and the authorities to assess the situation and any potential impact on flights.
