Germany 's Deso Dogg converted to Islam , taped propaganda for al Qaeda . Peter Bergen : Jihadists have shifted focus from Afghanistan - Pakistan to Syria . And the U.S. should make clear to countries such as Saudi Arabia , which is supplying hundreds of Saudi fighters in Syria , that encouraging this kind of militancy could create a `` blowback '' problem in the Middle East in the form of terrorism directed at Arab regimes . He describes the influx of foreign fighters into Syria worries terrorism experts . Bergen : It 's feared they could learn new techniques they will take home and use .
Germany 's Deso Dogg converted to Islam , taped propaganda for al Qaeda . Peter Bergen : Jihadists have shifted focus from Afghanistan - Pakistan to Syria . He describes the influx of foreign fighters into Syria worries terrorism experts . Bergen : It 's feared they could learn new techniques they will take home and use .