At the center is a cell known as the Khorasan group, a cadre of veteran al-Qaida fighters from Afghanistan and Pakistan who traveled to Syria to link up with the al-Qaida affiliate there, the Nusra Front.
But the Khorasan militants did not go to Syria principally to fight the government of President Bashar Assad, U.S. officials say. Instead, they were sent by al-Qaida leader Ayman al-Zawahiri to recruit Europeans and Americans whose passports allow them to board a U.S.-bound airliner with less scrutiny from security officials.
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