A Gatwick spokeswoman has said the passengers involved in the emergency landing were being looked after in a specially set-up reception area at the airport.
Some incoming flights have been diverted, with some now landing at Stansted Airport in Essex instead.
The spokeswoman did not know how long it would take for the plane to be moved from the runway and normal take-offs and landings to resume.
More top news
Theresa May said she is "ambitious and positive" for a Brexit deal as EU leaders gave the go ahead for preparations for second phase talks.
Merseyside Police have launched an investigation after crowd trouble at Goodison Park - during which a fan appeared to attack a player.
US-backed Syrian forces have declared victory in Raqqa days after it said it had cleared the city of members of so-called Islamic State.