Nuclear terrorist attack would 'change our world', says Obama

BBC - The threat from terrorists trying to launch a nuclear attack that would "change our world" is real, President Barack Obama has said.

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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.

More than 50 nations were represented at the summit.

World leaders convening in Washington for the summit expressed concern about North Korea's nuclear weapons programme and Russia's lack of attendance.

Mr Obama expressed concern that Russia has been building up its military at the expense of nuclear arms reductions.

Russian President Vladimir Putin refused to attend the summit, and Prime Minister Nawaz Sharif of Pakistan cancelled his trip after the deadly bombing in Lahore. Both countries are nuclear-armed.

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