CNN CNNI Simulcast December 20, 2014 10:07:00
Of this country's power plants, one by one. just to see if anything has been compromised. this is happening after some hackers, suspected hackers posted on a website that the virus was in place and they could activate it at anytime. now, this could very well be an empty threat. after the spectacular sony hack, natalie, they can't be too careful. >> absolutely. they are worried about their nuclear facilities. what u.s. government agencies do south korean investigators worry about as hacking targets? >> reporter: well, as i was speaking with the professor, the first thing he said was nasa. the r...