North Korea on Friday accused the U.S. Central Intelligence Agency and South Korea's intelligence service of a failed plot to assassinate its leader Kim Jong Un with a biochemical bomb at a military parade in Pyongyang.

North Korea has a history of accusing the United States and South Korea of planning preemptive military attacks and to target its leaders, but analysts said it could be the first time it has accused the allies of an actual assassination attempt.

Pyongyang presented extensive details but offered no concrete proof to back its accusations of the plot, which it said could never have succeeded.