Chongjin

Over the weekend, Pyongyang also detained three officials at the northern Chongjin shipyard, where the destroyer was built and where its launch failed.

KCNA, North Korea's official news agency, identified those detained as the chief engineer of the northern Chongjin shipyard where the destroyer was built, as well as the construction head and an administrative manager.

None of the reports mentioned any casualties or injuries as a result of Thursday's incident in the eastern port city of Chongjin.

Kim attributed Thursday's accident, which took place at a shipyard in the eastern port city of Chongjin, to "absolute carelessness, irresponsibility and unscientific empiricism".

Seoul's spy agency also released aerial photographs of Ussuriysk and Khabarovsk, where they say hundreds of North Korean troops have gathered, and another photo of North Korea's Chongjin port, where a Russian ship was reportedly shown carrying North Korean soldiers.