FILE – In this Jan. 30, 2015 file photo, a Syrian Kurdish sniper looks at the rubble in the Syrian city of Ain al-Arab, also known as Kobani. Foreign fighters are streaming in unprecedented numbers to Syria and Iraq to battle for the Islamic State or other U.S. foes, including at least 3,400 from Western nations and 150 Americans, U.S. intelligence officials conclude. In all, more than 20,000 fighters have traveled to Syria from more than 90 countries, top intelligence officials will tell Congress this week. (AP Photo, File)