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(CNN) - U.S. Attorney General Eric Holder is worried about wholes that are greater than the sum of their parts.
Take, for instance, the current mix of bomb-makers from Yemen with foreign fighters in Syria.
"That's a deadly combination, where you have people who have the technical know-how along with the people who have this kind of fervor to give their lives in support of a cause that is directed at the United States and directed at its allies. And it's something that gives us really extreme, extreme concern," he told ABC's "This Week."