korea ratcheting up tensions with the united states, sentencing an american citizen kenneth bay to 15 years of hard labor. the tour guide from washington state is accused of carrying out serious crimes against north korea. but no word on exactly what crime he committed. senior international correspondent dan rivers is live in seoul. what do we know about the case against kenneth bae? >> reporter: you know, we really know very little about what he is alleged to have done. a few snip its from the official news agency in north korea saying hostile acts. we don't actually know what the crimes were. now one of his friends in south korea has speculated that perhaps he was taking photos of something as innocuous as orphans begging on the streets and that may have been misinterpreted as something he was going to use against the regime when he went back into china. he is in and out of north korea