[AmericanInTokyo]

The crew were trained as spies, who also carry out drug export programs crafted by North Korean leadership. Their interlocutors in Japan are members of the Chosen Soren North Korean underground spy community. A mixture of both.

[Tennessee_Bob]

The crew were trained as spies, who also carry out drug export programs crafted by North Korean leadership. Their interlocutors in Japan are members of the Chosen Soren North Korean underground spy community. A mixture of both.

And they know this from interviewing the survivors? Oh, wait, there weren't any. So they must have known this from going over the boat...oh..wait, it sank. So they knew this from the wreckage? No, wait, that was minimal (although they're talking about raising the wreckage so they can examine it).

Last I heard, the Japanese weren't exactly sure who it was, and the North Koreans haven't made a peep about it on their news website. It's an enigma, wrapped in a mystery.