Defense Tech: North Korea's One Ton Bomb?: "The Financial Times reports a North Korean defector claims 'Kim Jong-il's regime has made a one-tonne nuclear bomb and is working on lighter weapons that could be fired more reliably, according to a South Korean magazine.'

Is this plausible? Yeah, kinda."

...

Rowan Scarborough (of the Washington Times) reported on a classified DIA report that estimated the NORKs couldn't do better than 650-750 kg (1,400-1,700 lbs).

So, one ton is at the edge of plausible, but my guess is they aren't that good.

(Via a DefenseTech.)