Who is Chasing Down the WannaCry Criminals?

   I've not followed the WannaCry ransomware story as close as I should. But, from what I have heard, I am left wondering what charges the cybercriminals are guilty of in the various countries, and whether we expect to be able to apprehend them.

   Although the damage is largely overseas, I believe some has been done in the U.S. and they remain a threat to the U.S. Who is chasing them down? The FBI? What investigative agency is after them? Because I tend to think we need an agency in place, or a branch of an existing agency, that specializes in cybercrime.

   And, what laws are they guilty of breaking? For I wonder if we need new laws, specific to cybercrimes.