NHK World-Japan:
US researchers say satellite images suggest North Korea may be preparing to deploy a ballistic missile-capable submarine.
Researchers at the Middlebury Institute of International Studies and satellite operator Planet Labs have told NHK that they have analyzed images of a shipyard in the eastern port city of Sinpo.
On September 3 at least 13 pillar-like objects could be seen along a quay, with some vehicles moving around.
