A plane carrying new Foreign Secretary Boris Johnson had to make an emergency landing on its way to Brussels.
The plane, described by the Ministry of Defence as a small military aircraft, had a "technical issue" after it took off from RAF Northolt on Sunday afternoon and had to land at Luton Airport.
A Foreign Office spokesman said: "There was a technical issue on the RAF flight on Sunday afternoon carrying the Foreign Secretary and his officials from London to Brussels that required the aircraft to land at Luton Airport.
"The Foreign Secretary thanked the RAF crew for their professionalism and was grateful to Luton Airport for the brief, unscheduled welcome. After a short delay the Foreign Secretary continued on his way to Brussels by alternative means."
This is the first flight and foreign trip Johnson has been on since he was appointed Foreign Secretary last week.
The Foreign Office would not say how Johnson got to Brussels after the emergency landing, saying it does not comment on travel plans. Johnson did tweet to say he was leaving for Brussels.
A spokesman for Luton Airport said: "At 17.26 an RAF aircraft landed safely at London Luton Airport after reporting a technical issue.
"Emergency procedures were put in place and all 16 passengers left the aircraft safely. Several scheduled flights were disrupted whilst the runway was cleared. The runway reopened at 17.59."