North Korea is not sending “encrypted spy messages” via a Youtube channel allegedly linked to its state radio, researcher Martyn Williams told NK News on Sunday, despite South Korean media reports stating otherwise.

On Saturday, Yonhap News Agency reported that a DPRK-managed channel had recently “broadcast a series of mysterious numbers, presumed to be an encrypted message to its spies,” claiming the video marked the first time Pyongyang had used YouTube to send “apparently coded messages” online.

But Martyn Williams, founder and owner of the North Korea Tech website who has previously writtenabout the phenomena of so-called numbers stations,