A United Nations report from May 2015 showed that 25,000 "foreign terrorist fighters" from 100 countries had joined "Islamist" groups, many of them working for ISIL or al-Qaeda.
En anden FN-rapport fra maj 2015 viser, at 25.000 udenlandske krigere fra 100 lande har tilsluttet sig "islamistiske" grupper, mange af dem arbejder for IS eller al-Qaeda.