U.S. officials now say that the man picked to bring a bomb onboard an airliner bound for the United States was actually an agent working on behalf of the CIA. That's the latest twist in a complicated tale — and it raises questions about just how dangerous the group behind the plot really is.
Melissa Block talks to Robert Grenier, former director of the CIA's Counterterrorism Center, about how moles are recruited in operations similar to the one which revealed the most recent "underwear" bomber plot.
In the post-Sept. 11 world, intelligence operations are discussed much more freely. This was evident once again with the foiled bomb plot in Yemen. Despite the sensitivity of the case, the details have come out quickly.
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