https://www.longwarjournal.org/archives/2020/02/london-terrorist-was-being-followed-by-authorities-when-he-attacked.php "Amman had been imprisoned for terror-related offenses...[b]ut he was released…
London terrorist was being followed by authorities when he attacked | FDD's Long War Journal
The Islamic State claims that the stabbings on Streatham High Road in south London yesterday were the work of its fighter. Sudesh Amman has been identified as
"Amman had been imprisoned for terror-related offenses...[b]ut he was released early..."