Evidence points to an external explosion sinking the Chonan

Something very big and very urgent has landed on my virtual desk this morning, so I don't have time to get into the most recent evidence of an external attack on the Chonan,  which points toward the dreaded possibility that it was sunk by a North Korean mine, torpedo, or submersible.

Instead, I will point you toward Joshua's excellent roundup of the latest information. A snippet:

One possibility raised is of a mine left over from the Korean War, but none has been found since 1984, and it just doesn’t seem likely that one would destroy a warship in an area patrolled this frequently only now, when North Korea happens to be raising tensions. It seems more likely that whoever placed the mine — if it was a mine — probably did so recently.

That is from his latest update, but the whole post is worth reading.