A US air raid on an Islamic State training camp in Libya was launched from an RAF base in Suffolk.
The attack, launched from RAF Lakenheath on Friday, has been welcomed by Defence Secretary Michael Fallon.
He said: "I welcome this strike that has taken out a Daesh (Islamic State) training camp being used to train terrorists to carry out attacks.
"I was satisfied that its destruction makes us all safer and I personally authorised the use of our bases."