A defendant in the hacking assault on South Korean nuclear reactors has used multiple Internet protocol (IP) addresses based in China, researchers said.

Its watch amount has raised following the publication last week of a variety of advice regarding the nuclear power plant operator in the South against strikes on Twitter.

It contained guides and layouts for just two reactors, along with private advice on some 10,000 workers at Korea Hydro and Nuclear Power (KHNP).
An IP address, nevertheless, isn’t always a dependable guide to the nationality or geographic place of an Internet user.

On Twitter the hacker posted more info on Tuesday, including four files of reactor-related advice and what appeared to be patterns of facilities, among other stuff.

The KHNP said the content released on the Wolsong and Gori nuclear power plants wasn’t classified and wouldn’t impact security.

The investigation team said it’s additionally requested help from the FBI to research the servers of US-based Twitter, Yonhap reported.

They said the information released so far seemed to be from the power plants’ operating system, which until April 2013 was connected to the world wide web, Yonhap reported.

But KHNP however established a two-day practice Monday to examine its capability to thwart a cyber attack, following the string of leaks that were on-line.

The exercise came at a time of heightened anxiety about cyber crime after a crippling strike against Sony Pictures which both Washington and Seoul have attributed on North Korea.

There’s been no sign that the North was behind the discharge of the atomic substance.

But Justice Minister Hwang Kyo-Ahn said in parliament that researchers were looking into a potential cyber attack by North Korea.