But there are two serious questions that worry genuine doubters: can America's nuclear weapons be kept safe and effective without explosive tests, and can the promise of a comprehensive test ban be comprehensively verified?

ECONOMIST: No more tests

Bottom line: In such an explosive economy, there will be no safe harbors for traditional "value" stocks.

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The Orange County Sheriff's bomb squad was on campus Monday examining the explosive devices, which have been made safe.

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State-run KCNA news agency said the test was "carried out at a high level in a safe and perfect manner using a miniaturised and lighter nuclear device with greater explosive force than previously".

BBC: North Korea nuclear test branded 'serious threat' to US

Explosive teams looked into it, and in the meantime passengers in the terminal were moved "a safe distance away, " he said.

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