A batch of leaked documents from Takfiri Daesh terrorist group shows the militant group has recruited some 22,000 militants from 51 countries.
The files were handed over to Sky News by a disillusioned former member of the terrorist group, the British television channel reported.
They include recruits from the UK and the rest of Europe, the US, Canada, North Africa and Middle East.
The TV channel said it had informed authorities of the documents, which were on a memory stick.
They were stolen from the head of Daesh internal security force by a former member of the so-called Free Syrian Army militant group before joining Daesh.
According to the report, the man, who called himself Abu Hamed, handed over the memory stick during a meeting at an undisclosed location in Turkey.
The documents resembled a typical job application form with 23 personal questions, including names, date and place of birth, hometown, telephone number, education and blood type.
Sky News said some of the names in the documents were already well-known, but the files could also help identify some extremists who had already been unknown to authorities in their countries.
Daesh terrorists, who are in control of parts of land in Syria and Iraq, have been committing heinous crimes against all ethnic and religious communities in Iraq, including Shias, Sunnis, Kurds, Christians and others.