Canadian-Iranian blogger Hossein Derakhshan has apparently been arrested during a return trip to Tehran. I say apparently because there's actually very little being reported on the incident at the moment. The best description and link roundup I've seen so far is at Z-Word: The Strange Case of Hossein Derakhshan.

'Hoder' is a long-time blogger who was one of my regular visits in the early days. Eventually I found he was less an interesting freedom-minded Iranian with a window into the East, and more of a person with a run of the mill Canadian Leftist viewpoint. He eventually took to supporting Iran's nuclear aspirations and defending Ahmadinejad over George Bush. The novelty wore out quickly at that point. A lot of the reformist Iranians hate him.

None of that is justification for his arrest, but it does make the whole thing very curious indeed. The actions of terror states are often capricious.