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How Many Americans in ISIS? No One Knows

Known Unknowns

Senior officials have been giving wildly disparate estimates of how many Americans are fighting for ISIS—because U.S. intelligence doesn’t really know the answer to the question.

articles/2014/09/05/how-many-americans-in-isis-no-one-knows/140905-lake-americans-isis-tease-new_o9dfow
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