A Ryanair passenger flight from Lithuania to London Stansted was given an escort by Royal Air Force Typhoon jets after a suspected hoax security threat.
The plane was travelling from Kaunas, Lithuania to Luton Airport but was diverted to Stansted. Flights were grounded for a short period before resuming just before 9am on Wednesday, according to a statement from Stansted Airport.
Ryanair says in a statement that the flight was diverted "after Lithuanian authorities received a suspected hoax security alert".
Photos posted on Twitter showed the RAF jets tailing the passenger jet at a low altitude over the UK.
Stansted often deals with hijacks and major security alerts and normally has the planes land on a remote field northwest of the terminal building.
Essex Police say the incident is "not believed to be a hijack situation or terror matter".