The threat from terrorists trying to launch a nuclear attack that would “change our world” is real, President Barack Obama has said.
The world has taken “concrete” steps to prevent nuclear terrorism, he told the Nuclear Security Summit in Washington.
But the so-called Islamic State (IS) obtaining a nuclear weapon is “one of the greatest threats to global security,” he added.
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At the summit, Mr Obama was asked about recent comments by presidential hopeful Donald Trump.
The Republican front-runner had floated the idea that Japan and South Korea should have nuclear weapons, a dramatic departure from decades of US foreign policy.
“The person who made the statement doesn’t know much about foreign policy, nuclear policy, the Korean peninsula or the world generally,” Mr Obama said.