The difference between knowledge and action

So Serbia's war crimes prosecutor Vladimir Vukčević says that he knows who is aiding Karadžić and Mladić. Or at least he has announced as much. But this seems like an odd thing for a prosecutor to announce, since he has neither named nor charged the people in question. Other agencies that might feel called upon to do something say that it is the job of the Bezbednosno-informativna agencija (BIA). But they have been too busy spying on parliamentary deputies in order to anticipate their votes, it would be a bit much to expect them to do any sort of job.