The Center for Strategic and International Studies said the images it published on its website, of North Korea’s Sinpo shipyard, showed several vessels within a secure boat basin, one of which resembled vessels previously used to tow a submersible test stand barge out to sea.

It said the activity was “suggestive, but not conclusive, of preparations for an upcoming test of a Pukguksong-3 submarine-launched ballistic missile from the submersible test stand barge”…

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