Germany 's Deso Dogg converted to Islam , taped propaganda for al Qaeda . Peter Bergen : Jihadists have shifted focus from Afghanistan-Pakistan to Syria . He says the influx of foreign fighters into Syria worries terrorism experts . Bergen : The U.S. has been bombing ISIS in Iraq and Syria, but it is unclear if that will be enough to defeat them.
Germany 's Deso Dogg converted to Islam , taped propaganda for al Qaeda . Peter Bergen : Jihadists have shifted focus from Afghanistan-Pakistan to Syria . He says the influx of foreign fighters into Syria worries terrorism experts . Bergen : It 's feared they could learn terror techniques they will take home and use .