The suicide bomber who killed 22 people at a pop concert at the Manchester Arena had been rescued from the civil war in Libya by the British Royal Navy three years previously.
Salman Abedi was 19 when he was evacuated from Tripoli in 2014 with his younger brother Hashem and more than 100 other British citizens. They were taken to Malta where they caught a flight back to the UK.
In May last year, Salman Abedi killed 22 people, including seven children, at an Ariana Grande concert with a homemade suicide vest.
A British government spokesman said: "During the deteriorating security situation in Libya in 2014, Border Force officials were deployed to assist with the evacuation of British nationals and their dependants."
Abedi was being monitored by security services when he travelled to Libya, but his case was closed a month before his rescue.
His brother, Hashem, is being held in jail in Libya by a militia group, but the British government has requested his extradition to face trial for his involvement in the attack.
The request has so far been refused.