https://www.washingtonpost.com/world/foreign-fighters-flow-to-syria/2015/01/27/7fa56b70-a631-11e4-a7c2-03d37af98440_graphic.html
January 27, 2015
Foreign fighters flow to Syria
The number of foreign fighters who have joined the Islamic State in Syria and Iraq now exceeds 20,000, up from the 15,000 estimated last October. According to ICSR, nearly a fifth of the fighters come from Western European nations.
Gene Thorp and Swati Sharma/The Washington Post Map: Flow of foreign fighters to Syria