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World Leaders: Nuclear Terrorism A ‘Grave Threat’ — BBC World leaders have called for closer co-operation to tackle the threat of nuclear terrorism at a summit on nuclear security in Seoul. A communique at the end of the summit reiterated a joint call to secure “vulnerable nuclear material”. South Korean President Lee Myung-bak said nuclear terrorism remained a “grave threat”, while US President Barack… Broadcasting platform : YouTube Source : War News Updates Discovery Date : 27/03/2012 03:18 Number of articles : 2