Why do foreign fighters join the Islamic State?

Aired: 8/27/2014 | 0:09:03 | Clip
Douglas McAuthur McCain, an American man who was killed while fighting for the Islamic State in Syria, is not the first U.S. citizen to die as an Islamic militant in the war-torn country, and the FBI warns there are dozens more still fighting. For more on why Americans and others are joining terror groups abroad, Gwen Ifill talks to Humera Khan of Muflehun and Jessica Stern of Harvard University.

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