The country has even pointed fingers at Seoul to be fabricating the stories as a reaction to the ongoing tensions between the two rival countries.

The state Internet research institute in North Korea was cited by Agence France-Presse as saying that Pyongyang had never been involved with any sort of cyber warfare against South Korea.

Designs, manuals and other details about South Korean reactors and personal information about the operating company’s workers were leaked out on Twitter in December last year.

Consequently, Seoul had to heighten cyber-security measures. The South Korean capital also started an investigation involving experts, government authorities and state prosecutors, reports PressTV.

Following the reports, South Korea had accused its northern neighbour to drive the country into "social chaos" through cyber hacking. The country declared the attempts to be a threat to the lives of its people and their safety.

The hacking allegations on North Korea are, however, not new. South Korea had been indicting its neighbour for hacking into its military institutions, banks, government agencies, TV broadcasters and media websites in the past as well.