Exclusive: Inside U.S. Mission to Secure Weapons-Grade Nuclear Material

When the massive 8.8 magnitude earthquake hit Chile on Feb. 27, it devastated villages, displaced millions of people and took the lives of hundreds more. But amid the chaos, a classified and highly sensitive operation by Americans and Chileans was underway on the outskirts of Santiago, the Chilean capital, to secure weapons-grade nuclear material -- the kind terrorists are keen to get their hands on. "Nightline" was in Chile for several days before the quake struck documenting the work of the...Full Story
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