Sussex Police, the local force, said a security cordon would remain in place while the matter is dealt with.
Gatwick, Britain's second busiest airport which is located about 30 miles south of London, said earlier it had evacuated a large part of its South terminal, citing a security incident.
"Police were called to the South Terminal at Gatwick Airport at 8.20am on Friday following the discovery of a suspected prohibited item in luggage," Sussex Police said in a statement.
"As a precaution, an EOD (Explosive Ordnance Disposal) team is being deployed to the airport."
Airport authorities said on X that passengers were being kept out of the building while the incident was ongoing, while police said there was significant traffic disruption in the area and advised people to avoid it.
In a separate incident earlier on Friday, London police carried out a controlled explosion near the U.S. embassy in south London after discovering a suspect package.
