The site claimed that it had seen evidence from a USA government source revealing how a test of the Hwasong-12 missile on the 28 April ended badly when the rocket crashed into the city of Tokchon, north-east of Pyongyang.
As per a U.S. government source, the first stage engines of the missile failed around a minute after the launch. The crash landing reportedly caused extensive damage to a complex of industrial or agricultural buildings, The Diplomat said.
The Daily Mail noted that the city of Tokchon is inhabited by about 200,000 people.
The unnamed source showed The Diplomat images from Google Earth from today compared to ones taken in 2016 to show the damage.
Satellite images show damage caused by a failed test launch that struck Tokchon, a city of 200,000 in the interior of Kim Jong-un's secretive state, according to a USA government official.
The Tokyo-based Diplomat news website has reported that a missile test conducted in early 2017 went wrong and landed in a city instead.
There are claims North Korea may have accidentally hit one of its own cities with a missile.
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It marked the first missile launched since one was sacked across Japan and into the Pacific Ocean on September 15. It was meant to soar east and splash into the Sea of Japan, where most missiles tested in Pyongyang's ongoing nuclear and military build-up end up.
In the weeks after the failed April 28 launch one of three failures in that month - the Hwasong-12 enjoyed a successful launch on May 14.
South Korean officials offered high-level talks with North Korea to find ways to cooperate on the Olympics and discuss other inter-Korean issues.
In November a successful Intercontinental Ballistic Missile launch, the massive Hwasong-15 that led Prime Minister Malcolm Turnbull to label North Korea "a criminal nation", proved Kim Jong-un could reach "all parts of the USA mainland", the communist state claimed.
The missile's failure was widely reported at the time but it was not previously known that the Hwasong-12 crashed in a populated area.
However, the cold relationship between South Korea and the North showed signs of thawing in the beginning of 2018.
Things on the Korean Peninsula have been seemingly quiet lately.