With President Trump promising to stop North Korea developing nuclear weapons, these are also tense times, when Pyongyang could have been tempted to hit back at the US. The statement said Kim had received a total payment of about US$740,000 and was given satellite transceivers and other materials and equipment.
Officials at South Korea's National Intelligence Service weren't immediately reachable for comment.
Meanwhile, tensions between North Korea and the U.S. continue to escalate; the U.S. House of Representatives voted by 419-1 yesterday to approve legislation to tighten sanctions on North Korea.
The denouncement of the USA and South Korea governments follows a visit from CIA Director Mike Pompeo to Seoul this week, The Washington Post reported.More news: Watch Game 3 NBA Playoffs 2017 Online
In a statement carried on state media, North Korea's Ministry of State Security said it will "ferret out and mercilessly destroy" the "terrorists" in the CIA and South Korean intelligence agency responsible for targeting its supreme leadership.
It did not mention Kim Jong-un by name, but he is widely referred to as the supreme leader.
"I think that is actually a good sign because it shows that China is bringing influence to bear on North Korea", he said.
North Korean news agency KCNA, claimed the alleged plot included the use of "biochemical substances including radioactive substance and nano poisonous substance".More news: Navy says Russian jet came within 20 feet of US spy plane
Analysts say such an assassination operation would be extremely hard to plan and carry out given the massive security around the supreme leader. "Korean-style anti-terrorist attack will be commenced from this moment to sweep away the intelligence and plot-breeding organizations of the USA imperialists and the puppet clique".
The alleged plan to use a biochemical agent on a member of North Korea's ruling family resembles the assassination earlier this year of Kim Jong Un's exiled half brother at a Malaysian airport.
KCNA said Kim viewed Yeonpyeong from an observation post on Jangje Islet, before calling for combat readiness from North Korea.
FILE - In this July 15, 2016 file photo, Ko Hyon Chol, seated right, speaks to reporters in Pyongyang, North Korea, when North Korea presented Ko as a man it alleges is a South Korean spy who tried to enter the North to kidnap children.More news: Buffett calls Obamacare replacement 'a huge tax cut for guys like me'
Kim's visit to the military units reported on Friday demonstrated a similar motive: signaling a readiness to fight, while steering clear of weapons tests condemned as "very bad" by US President Donald Trump, Yonhap reported.
- One Major Flaw In Rugby World Cup Draw Being So Early Surfaces
- Korea's new president to White House; N. Korea calls for 'new chapter'
- Kim Kardashian And Caitlyn Jenner Aren't Speaking
- Donald Trump Accuses James Comey Of 'Spying' After Firing Him
- Acting FBI Director McCabe contradicts White House claims about Comey termination
- Trump Signs Order Calling for Offshore Drilling Review
- Trump contradicts his own White House team on Comey firing
- Scottish Conservatives launch Angus general election campaign
- Chelsea boss Conte drops hint to Roman: 'Money explains value'
- Tesla Begins Taking Orders For Its Solar Energy Roof Tile Systems