Okay - I now have an idea, according to the article itself (try reading, Claws!). The below is an excerpt from the NK News article.
‘The wartime preparations were not observed in Pyongyang, further sources said, and were restricted to locations outside of the capital – particularly on the east coast of the country.
The developments come during a time of sharpened tensions surrounding the peninsula and in anticipation of a pending intercontinental North Korean ballistic missile (ICBM) test, an event which some say could result in a kinetic military response from the United States.
But such blackout and evacuation drills are extremely rare in North Korea, multiple other sources with long experience working inside or on the country told NK News, making it difficult to gauge their purpose amid the current atmosphere.
“I have never heard of this type of training exercises before in North Korea, but am not surprised,” said LTG Chun In-bum, a recently retired three star lieutenant general from the South Korean army. “They must realize how serious the situation is.”
In addition, a regular visitor insider with years of experience visiting the country told NK News that they had “never heard of (such preparations) happening.”
“There used to be air raid drills in 2003, but not since then,” the source said, who didn’t want to be identified due to the sensitivities of talking about military issues to the media. “A mass evacuation would be impossible not to notice.”
Another regular visitor working in the country conferred: “I have never heard of evacuation exercises happening before.”’