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A former Royal Mail postman turned Islamic State supergrass has revealed details of a secret unit that has sleeper cells planning attacks in the UK.

Harry Sarfo, 27, told prosecutors an elite group within the terror organisation has ‘clean’ agents waiting to strike.

Sarfo said masked men belonging to Islamic State’s secret service, known as Emni, told him they were organising attacks in Britain, France and Germany.

Sarfo, serving a three-year jail term in Germany for terrorist offences, told the New York Times in a prison interview: “They said, ‘Would you mind to go back to Germany, because that’s what we need at the moment,’

“He was speaking openly about the situation, saying that they have loads of people living in European countries and waiting for commands to attack the European people.”

(Image: Getty)

Sarfo, who moved to Enfield, north London, from Germany with his family as a teenager, said he was told this before the attacks on Paris last November.

He studied at Newham College, east London, before becoming a postman. He briefly lived in Erith, Kent.

Papers seen by the New York Times describe a multi-level secret service under the overall command of the Islamic State’s most senior Syrian operative, spokesman and propaganda chief, Abu Muhammad al-Adnani.

Below him are lieutenants tasked with planning attacks in different regions of the world, including a ‘secret service for European affairs’, a ‘secret service for Asian affairs’ and a ‘secret service for Arab affairs’, according to Sarfo.

At least 10 deadly attacks against Westerners have been directed or co-ordinated by the special unit of the Islamic State dedicated to exporting terror abroad.

(Image: Getty)

Operatives are selected by nationality and grouped by language into small, discrete units whose members sometimes only meet one another on the eve of their departure for missions abroad.

The NY Times said: “Based on the accounts of operatives arrested so far, the Emni has become the crucial cog in the group’s terrorism machinery, and its trainees led the Paris attacks and built the suitcase bombs used in a Brussels airport terminal and subway station.”

Sarfo attended a radical mosque in Bremen that had already sent about 20 members to Syria, at least four of whom were killed in battle.

He said the masked men told him ‘that there aren’t many people in Germany who are willing to do the job.

‘They said they had some in the beginning. But one after another, you could say, they chickened out, because they got scared — cold feet.

‘Same in England’.

Sarfo underwent training to be a special forces operative with ISIS in Syria but became disillusioned by the group’s cruelties.

He escaped into Turkey and caught a flight to Bremen where he was arrested upon arrival in July last year.