The Washington Post is reporting that North Korea is currently developing miniature nuclear warheads that are capable of fitting inside its missiles. The report stems from confidential intelligence reports read to the Post.

The findings are likely to deepen concerns about an evolving North Korean military threat that appears to be advancing far more rapidly than many experts had predicted. U.S. officials last month concluded that Pyongyang is also outpacing expectations in its effort to build an intercontinental ballistic missile capable of striking cities on the American mainland.

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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,” the assessment states, in an excerpt read to The Washington Post. The assessment’s broad conclusions were verified by two U.S. officials familiar with the document. It is not yet known whether the reclusive regime has successfully tested the smaller design, although North Korea officially last year claimed to have done so.

The DIA and the Office of the Director of National Intelligence declined to comment.

North Korea has been stepping up its military game since Donald Trump took office. The Trump Administration has orchestrated tougher UN sanctions on the communist nation, and UN Ambassador Nikki Haley has been particularly vocal about getting tough on the country.