North Korea has claimed that the aim was to kill Mr Jong-un during a public event in Pyongyang.
KCNA also said two intelligence services "ideologically corrupted" and bribed a North Korean surnamed Kim and turned him into "a terrorist full of repugnance and revenge against the supreme leadership of the DPRK". They then infiltrated the "human scum" into North Korea, giving him instructions previous year on how to assassinate Kim, the spokesman said.
The U.S. House of Representatives overwhelmingly approved legislation on Thursday to tighten sanctions on North Korea by targeting its shipping industry and companies that do business with the reclusive state.
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It said North Korea's nuclear program was needed for the "existence and development" of the country and 'can never be changed nor shaken'. A State Department spokesman called the allegations "ridiculous".
North Korea also makes an improbable claim that more than 30,000 North Korean defectors who fled to South Korea in the last two decades had been kidnapped by the South. Pyongyang has accused the US Central Intelligence Agency (CIA) and South Korea's National Intelligence Service (NIS) of plotting against North Korea. The North regularly issues threats of military action without following through on them.
The North's Ministry of State Security released a statement saying "the last-ditch effort" of USA "imperialists" and the South had gone "beyond the limits".
- "Empire of evil" - ==================== The lurid accusations come with Pyongyang and Washington at loggerheads over the North's banned weapons programmes, which have seen it subjected to multiple sets of United Nations Security Council sanctions.
The North believes the US and South are seeking to assassinate Kim, said Professor Koh Yu-Hwan of Dongguk University.
It could be the first time North Korea has accused the allies of an actual assassination attempt.
Trump has been taking a wide-ranging approach to North Korea and recently expressed an interest in meeting Kim in the right circumstances.
Further details mentioned in the report about the "terrorist" indicate that the individual's last name is also Kim and that the interaction with the Central Intelligence Agency and NIS occurred in June 2014.