A FORMER pizza delivery man who was killed after joining Islamic State used a well-known radical preacher banned from the UK as a referee when signing up to the terrorist group.

Abdul Raqib Amin from Aberdeen was one of 16 Britons among 22,000 people who applied to join Islamic State, according to newly-leaked documents.

He gave as his referee Omar Bakri, 56, who was blamed for radicalising Michael Adebolajo and Michael Adebolawe, the two men responsible for murdering Fusilier Lee Rigby outside army barracks in Woolwich in south east London.

The radical preacher has been banned from the UK since 2005 for his views, which includes justifying killing women and children.

The fact that he has been named as Amin’s recruiter will be of huge interest to British intelligence operatives.

The A4 typed sheet laid out in Arabic, and carrying the black flag of Islamic State (IS), paints the fullest possible picture of how Amin was groomed for service with the group – ultimately leading to his death via a drone strike in August last year.

It shows he was able to join IS by sneaking into the country via a refugee camp on the Turkish/Syrian border.

Bakri's name appears as a guarantor for would-be jihadis on nearly 20 application forms. Cardiff-born Reyaad Khan, 21 - killed last year alongside Amin in Raqqa, Syria - also cites the radical cleric as his referee.

Amin’s paperwork also shows how he lists his marital status as single, one of the driving forces friends say was behind him joining IS.

Friends have insisted it was the break-up from an unnamed girlfriend which pushed Amin over the edge - and eventually into the clutches of radicals.

Amin attended Sunnybank Primary and St Machar Academy, both in Aberdeen, and was a keen cricketer and footballer.

After fleeing to Syria, he is said to have texted his friends back home telling them he would “stay there forever” because he had nothing to live for in the UK.

One box on the form asks the former pizza delivery driver whether he would like to be a fighter or a suicide bomber.

He ticked “fighter”.More than 120 people ticked the other box, according to the leaked documents.

Amin lists his former employment as working in a shop. The Bangladeshi-born jihadist also describes his religious education as basic in one of the 23 sections that make up the questionnaire.  

Ethar Abdulhaq, of Middle Eastern news agency Zaman Al Wasl – which has been investigating the leak – said: “The man or men who filled out these forms have a very modest level of education.

“The forms are riddled with spelling mistakes.

“But filling in forms wasn’t the important thing for ISIS. What was important was getting as many people on their books as possible.”

Professor Anthony Glees, of the University of Buckingham’s Centre for Security and Intelligence Studies, said: “These forms show how simple it is to join ISIS.”

Yesterday, German media claimed the names of three of the Paris attackers were also found in the files, believed to date back two years.

At least 64 people with British connections have been identified in the leaked documents.