The secretary-general of the International Atomic Energy Agency (IAEA), Yukiya Amano, has called on the world to prevent extremists from having access to radioactive material.
"Nuclear security is a longstanding and real issue. This is a real threat in all countries where nuclear material is available to terrorists, " Amano said during a conference in the Philippines.
He added that, "If nuclear material falls into the hands of terrorists, that can be used for dirty bombs."