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Countering a Shapeless Terrorist Threat

Sep 10, 2015 | 08:00 GMT

Rescue helper carries out a woman on a stretcher after a bomb alter at terminal 2 on the Munich airport.
Rescue helper carries out a woman on a stretcher after a bomb alter at terminal 2 on the Munich airport on January 20, 2010 in Munich, Germany.

(Photo by Alexander Hassenstein/Getty Images)

Leaderless resistance has made terrorists harder to track, but they remain vulnerable at key moments....

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