It was an educated guess...No one would have been surprised though...
Korean bloggers are now starting to ask the question - if it was N.K., what is the appropriate response? . . .
What Should Be South Koreas Reaction If North Korea Sunk Korean Warship?
March 30, 2010
Defense Minister Says Warship May Have Hit NK Mine
March 30, 2010
http://www.rjkoehler.com/2010/03/30/defense-minister-says-warship-may-have-hit-nk-mine/
Discussion: What should Seoul do if it was a North Korean mine?
March 30, 2010
http://www.monster-island.net/2010/03/discussion-what-should-seoul-do-if-it.html