Officials were uncertain if Kim Jong Un had been able to accomplish building the warhead but a July 28 report from the Defense Intelligence Agency suggests that he has.
It will fit in to one of the missiles he has test launched in recent months and can carry dozens of nuclear bombs to be dropped on its target.
According to the report, officials now estimate Jong Un has 60 nuclear weapons in his arsenal.
By comparison, the US is estimated to have more than 6,800 and Russia is thought to have 7,000.
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‘The IC [intelligence community] assesses North Korea has produced nuclear weapons for ballistic missile delivery, to include delivery by ICBM-class missiles,’ it read.