Threats Persist as Obama Hosts His Final Nuclear Security Summit

President Barack Obama will host his fourth and final nuclear security summit in Washington this week with tons of loose nuclear material still not sufficiently secured and still potentially accessible to terrorists or other individuals with malicious intentions.   The White House says that while it is impossible to quantify the likelihood of a nuclear attack by extremist groups, there are 2,000 metric tons of highly enriched uranium and separated plutonium with civilian and military...

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