Gatwick Airport's North Terminal has reopened after a security alert prompted an evacuation.
The closure was prompted by the discovery of what police believed to be a firearm in a bin at the airport.
A 41-year-old man from Vendome in France was arrested at the scene on suspicion of discarding the suspected weapon.
He had not checked in or passed through any passport or security checks at the time, Sussex Police said.
A 41-year-old French man is being questioned after "what appears to be a firearm" was discovered at Gatwick airport's North Terminal, Sussex Police say.
1/2 UPDATE: North Terminal remains closed due to an earlier incident. Flights are departing from Gatwick however...
2/2 UPDATE: If you are expecting to travel from North Terminal this afternoon we recommend that you contact your airline for the latest info
We'd like to apologise to passengers for any inconvenience while the NT incident is investigated. We have extra staff on hand to assist.
The North Terminal at Gatwick was evacuated this morning after reports of a man performing 'suspicious actions'.
Sussex Police have confirmed that they have arrested a man in connection with the incident. Further details will follow.
Airline passenger Tim Unwin, who was caught up in the evacuation at the Sussex Airport, has sent out a series of messages and photographs via social media.
Very cramped in Sofitel - passengers are now beginning to get frustrated - would like to be given some information https://t.co/QClgOCV3oF
Helpful airport staff waiting to provide further information to passengers at Gatwick North https://t.co/PO4bhiUcK1
Sussex Police have arrested a man after an incident at Gatwick Airport. The site's North Terminal was evacuated this morning, and police called at 9.30am after 'suspicious actions' by a man who discarded an item at the airport.
Bomb disposal experts were called to the scene as a precautionary measure, to investigate the item.
"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.
"We are aware that there is concern about what has happened in France, but the general threat level remains the same and people should be aware as usual of anyone acting suspiciously."
Due to an incident - the North Terminal has been evacuated as a precautionary measure. Extra staff on-site looking after passenger welfare
Rail passengers will soon be able to use the Oyster pay-as-you-go card and contactless cards on train lines to Gatwick Airport.
The Department of Transport will introduce the contactless ticketing methods, which will also include five other Surrey stations along the route, to Gatwick in the New Year.
This technology will make journeys easier and ticketing considerably faster. Passengers with contactless bank or credit cards, for example, will simply need to touch the Oyster readers without having to queue for a ticket or even top up their Oyster card."
Nearly 13,000 people were adversely affected by the noise of Gatwick night flights in 2014 – a 15% rise on the previous year.
The figures, in a report by the Civil Aviation Authority, were revealed at a meeting of the Gatwick Airport Consultative Committee.
The CAA report also shows that the number of people who said they were more seriously affected by night time noise doubled in the past year.
Gatwick has recorded its busiest ever September, with four million people travelling through the airport.
Managers say they expect to hit another record this year, the 40 million annual passenger mark. They say it's another reason the site should be expanded instead of Heathrow.
A man who was tasered by police on board an aircraft at Gatwick airport has been detained under the Mental Health Act.
Sussex Police said the 37-year-old was taken off the easyJet flight to Belfast shortly after 8am yesterday after being arrested by firearms officers called to the aircraft by the crew.
The man, from Belfast, was arrested on suspicion of breach of the peace and obstructing/resisting a constable in the execution of their duty.
Earlier it was reported that the incident leading to the arrest was because he wanted to take two pieces of hand luggage on to the plane. Police said there were reports of a passenger who was becoming increasingly abusive following a dispute over luggage.
After the man was arrested, people were taken off the plane and witnesses gave statements to police.
"On Thursday evening, following examination by doctors, he was detained under Section 2 of the Mental Health Act for admission into a psychiatric unit for further assessment and treatment in the interest of his own health, safety and protection of others."
"EasyJet can confirm that police boarded flight EZY831 from London Gatwick to Belfast on August 20 due to a passenger behaving disruptively.
"EasyJet's cabin crew are highly trained to assess and evaluate all situations and to act quickly and appropriately to ensure that the safety of the flight and other passengers is not compromised at any time.
"Whilst such incidents are rare we take them very seriously, do not tolerate abusive or threatening behaviour on board and always push for prosecution.
"The safety and well-being of passengers and crew is always easyJet's priority."