The nuclear reactor hacker who last Christmas threatened to shut down some of Korea's nuclear power plants... is back.<br />And this time he or she is demanding money for not handing over sensitive data to third countries. <br />Connie Kim has the details. <br />The hacker that threatened to shut down Korea's nuclear facilities last year has come back with a fresh threat.<br />Using the same twitter account, the hacker demanded money and warned that countries from Northern Europe, Southeast Asia and South America want to buy Korea's nuclear reactor information. <br />There was no specified amount for the payout but the message did say nuclear authorities should send an email to the stated address if it's willing to take the offer. <br />Along with the threat,... more than 20 files were released including floor maps and transcript of a phone conversation between President Park Geun-hye and United Nations Secretary General Ban Ki-moon. <br />An official from the state-run Korea Hydro and Nuclear Power Company said it's looking into how the information got leaked and how sensitive the released documents are. <br /><br />The threat comes about three months after the hacker threatened to destroy power plants if the company didn't halt operations at three of Korea's nuclear facilities by Christmas last year.<br />No destruction was done to the reactors even after the shut-down deadline, and the nuclear power company had insisted the released data posed no threat.<br />However, the hacker's comeback is raising concerns as the person behind the nuclear power hack still hasn't been identified, even after months of investigation<br />Connie Kim, Arirang News.