FILE - In this Jan. 9, 2013 file photo, North Koreans work at computer terminals inside the Grand People's Study House in Pyongyang, North Korea. Investigators have yet to pinpoint the

 

              FILE - In this Jan. 9, 2013 file photo, North Koreans work at computer terminals inside the Grand People
FILE - In this Jan. 9, 2013 file photo, North Koreans work at computer terminals inside the Grand People's Study House in Pyongyang, North Korea. Investigators have yet to pinpoint the culprit behind a synchronized cyberattack in South Korea last week. But in Seoul, the focus remains fixed on North Korea, where South Korean security experts say Pyongyang has been training a team of computer-savvy “cyber warriors” as cyberspace becomes fertile battlegrounds in the standoff between the two Koreas. (AP Photo/David Guttenfelder, File)