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Sources: Former Guantanamo detainees suspected of joining ISIS, other groups in Syria

As many as 20 to 30 former Guantanamo Bay detainees released within the last two to three years are suspected by intelligence and Defense officials of having joined forces with the Islamic State and other militant groups inside Syria, Fox News has learned. The development has cemented fears that the U.S. military would once again encounter militants taken off the battlefield.

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