Top US security threats: lone wolves, Syria fighters-officials
 

(Adds comments,background) By Doina Chiacu WASHINGTON, Sept 17 (Reuters) - Americans radicalized by online propaganda from Islamic State and other militant groups pose the main terrorist threat to the United States, which is especially vulnerable to foreign fighters returning from Syria, senior U.S. security officials said on Wednesday. While there is ** evidence that the radical Islamist group plans an attack on U.S. soil, its vigorous propaganda machine and sophisticated online recruitment efforts created a clear potential threat, they said. ...

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