North Korea has accused the United States and South Korean spy agencies of an unsuccessful assassination attempt against leader Kim Jong-un involving biochemical weapons.
North Korea has alleged that USA and South Korean agents are plotting to kill Kim Jong-un, its leader.
North Korea is accusing the US and South Korea of plotting to assassinate leader Kim Jong-un.
State media reports quoted the country's security ministry as saying it would "ferret out and mercilessly destroy" the agents in the US and South Korean spy agencies it accuses of plotting the attack.
North Korea's ongoing nuclear and ballistic missile tests have been a concern for the Trump administration, who have made efforts to step up diplomatic pressure on the country.
North Korea has also repeatedly accused the US of plotting preemptive nuclear strikes on Pyongyang, practicing dropping nuclear bombs on North Korea with planes which aren't even capable of carrying nuclear devices, and planning a massive invasion of the North.
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North Korea warned that U.S. hostility brought the region to the brink of nuclear war.
"(North Korean leader) Kim Jong Un needs to maintain his lifestyle, so he will never start a war.
United States sets up missile defense in S. Korea as North shows power
The State Department said China has taken some steps against North Korea , but it needs to take more such steps. Trump said in the interview he wants South Korea to pay the cost of the THAAD, which he estimated at $1 billion.
Relations between North Korea and China have been deteriorating for the past year.
For January and February, a country believed to be China reported that it imported 1.44 million tons and 1.23 million tons of coal from the North, respectively.
Bruce Klingner, a former Central Intelligence Agency analyst now at the Heritage Foundation think tank, said it could be the first time North Korea had accused the allies of an attempted assassination.
The CIA told its agent Kim it had access to radioactive and "nano poisonous" substances whose lethal results would appear only after six to 12 months, the statement said.
While their government and military are keeping watch on nuclear- armed North Korea amid current tensions, many South Koreans are in holiday mode this week. Harsh criticisms have come from official sources in China about the North's nuclear program. Both Malaysia and South Korea have blamed the North for the assassination, which retorts that the accusations are an attempt to smear it.
The North warned that China was testing its patience and that such actions would trigger "grave" consequences.
Fears have intensified in recent weeks, with US President Donald Trump warning of a "major conflict" with the North and Pyongyang proclaiming it is prepared.
But he also said this week he would be willing to meet Kim Jong-un, in the right circumstances. He said the claim was more likely a North Korean response to "escalating threats" from the USA side.
But it carried out a controversial supposed satellite launch-which Seoul and Washington say was a covert test of a long-range missile-just a week before the last presidential election in 2012.