An ISIS fanatic who MI5 warned poses a terror threat has been granted the right to live in the United Kingdom.
The Sudanese man, who snuck into Britain illegally, can remain in the country on human rights grounds.
However, Security Services have produced evidence suggesting he may be a danger and might might encourage other extremists to launch attacks in the UK.
Judges ruled against sending him back to Sudan amid fears he could be detained and tortured.
A member of ISIS with an ISIS flag
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The man, known as S3, first entered Britain illegally 18 years ago and was granted asylum.
He subsequently travelled to and from Sudan without any issues.
MI5 claimed S3 is an ISIS propagandist who spreads vile material calling for jihad against the West.
British officials stripped the man of his passport in 2018 but he returned illegally for a second time.
Immigration judges ruled he can remain living in the UK with lifelong anonymity earlier this month.
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The Mail on Sunday has seen court documents warning the man “had demonstrated a commitment to the extremist ideology of ISIS”.
The documents stated: “There was a realistic possibility that [he] would seek to radicalise other individuals and encourage them to engage in Islamist extremist activities.”
Three judges at a court called the Special Immigration Appeals Commission made the ruling against the Home Office.
Anonymity provides S3 with the opportunity to live in the UK without neighbours, work colleagues and the public knowing that he is potentially a dangerous terrorist who wants to launch deadly attacks in Britain.
S3 entered the UK just days after the 7/7 attacks in July 2005.
Male lawyer working with contract papers and wooden gavel on tabel in courtroom
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He immediately launched an asylum claim but the Home Office has attemped to deport him several times.
The Sudanese man obtained British citizenship in 2015.
He was found to have travelled to Sudan in February 2016 before returning one month later.
S3 also applied for a Sudanese residence permit which would alllow him to enter and exit the country for five years just months later.
The Home Office declined to comment, saying: “It is long-standing Government policy that we do not routinely comment on individual cases.”