A South Korean police officer from the Digital Forensic Investigation unit leaves the Cyber Terror Response Center at the National Police Agency in Seoul on Friday, March 22, 2013. (AP Photo/Ahn Young-joon)

Photo by: Ahn Young-joon

A South Korean police officer from the Digital Forensic Investigation unit leaves the Cyber Terror Response Center at the National Police Agency in Seoul on Friday, March 22, 2013. (AP Photo/Ahn Young-joon)