As many as 64 Britons or people with links to the UK have been identified among thousands of leaked Islamic State files handed, an investigation has revealed.

The dossier also has details of around 500 'graduates' of two training camps in Syria.

The camps are the same as those revealed last year where recruits were being trained for missions abroad.

The details are among tens of thousands of documents, containing names, addresses, telephone numbers and family contacts of Islamic State jihadis, that were obtained by Sky News last week.

They were delivered on a memory stick from a disaffected former IS recruit.

In the first camp, 371 are listed as having successfully completed their training, with four of those from the UK.

Others who passed through the camp were from the United States, France, Belgium, Germany and New Zealand.

The youngest, from Turkmenistan, was just 14 years old and nine of them were under 16.

Anyone who passed through the camp received a graduation 'certificate' that allowed them to prove they had completed their training.

Among the names of those who passed through the camp was Al Mahdi Owlad Manshara, a Moroccan who was described as a chemical missile specialist.

It comes after Sky News revealed that IS militants have been modifying weapons systems capable of targeting passenger jets and military aircraft.

In the second training camp, among the 110 who passed was a Briton - listed on the papers as Anosh, and also known as Abu Dujana al Britani, from Manchester. He has been listed as dead by the SITE Intelligence Group.

The papers say Anosh's sponsor was Abu al Qaqaa al Britani, whose real name was Raphael Hostey, a married father born in 1992 who left Manchester to travel to Syria in 2013.

Hostey, a graphic designer, took at least one-and-a-half months to reach the Syrian border post of Bab al Hawa, about 25 miles (40km) west of Aleppo in October of that year.
The files say Hostey, whose whereabouts are unknown, was recommended by Abu Abd al Rahman al Britani.

Another also recommended by Abu Abd al Rahman was Khalil Raoufi, also known as Abu al Laith al Kharsani, a trainee mechanical engineer.

Raoufi, born in 1994, was also married with a child when he left Manchester and headed to Bab al Hawa via Afghanistan, Pakistan and Canada. He is now dead.

Investigators are probing whether some of the fighters may have been sent home to carry out attacks on Western soil.