"The U.S. and South Korea shall promptly arrest all the organizers, participants and followers of the extra-large state-sponsored terrorist crime against the supreme leadership of (North Korea) and deliver them to it", the office said in an English statement carried by the Korean Central News Agency.
The CIA and the U.S. White House declined to comment on the statement from the North's Ministry of State Security last week.
Pyongyang will seek the extradition of anyone involved in what it says was a CIA-backed plot to kill leader Kim Jung Un last month with a biochemical poison, a top North Korean foreign ministry official said Thursday.
Although he vowed to "punish the organisers, conspirators and followers of this awful state-sponsored terrorism" through extradition requests, the country is yet to name any foreign suspects.
According to state media reports, the coerced North Korean is a resident of Pyongyang who had previously been working in Russia's timber industry.
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The North further said that a South Korean agent named Jo Ki Chol and a "secret agent" named Xu Guanghai, director general of the Qingdao NAZCA Trade Co. The North also said "a guy surnamed Han" taught Kim how to enlist accomplices.
Officials claim the Central Intelligence Agency and South Korean spies bribed a North Korean citizen to carry out a biochemical attack.
It reiterated the government's determination "to hunt down and mercilessly smash every single one of the terrorist maniacs of the CIA and the South Korean" Intelligence Service.
"We urge the relevant authorities to immediately detect and arrest and hand over to the DPRK the masterminds of the disgusting state-sponsored crime, accomplices and their followers", the office said, referring to the country by the initials of its official name, the Democratic People's Republic of Korea.
Washington has suggested military action could be on the table but President Donald Trump has softened his message more recently, saying he would be "honoured" to meet North Korean leader Kim Jong-Un.
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