Obama Warns of Nuclear Terrorism Threat

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WASHINGTON—U.S. President Barack Obama said in his weekly Saturday address “no terrorist group has yet succeeded in obtaining a nuclear device or producing a dirty bomb using radioactive materials,” but al-Qaida has tried.
The president delivered his address from the Nuclear Security Summit where world leaders gathered to discuss what Obama described as “one of the greatest threats to global security – terrorists getting their hands on a weapon of mass destruction.”