BBC News, 25 June, 2013

South Korea has issued a cyber alert after an apparent hacking attack on government websites. The website of the presidential office was one of several official and media sites hit by an apparently co-ordinated attack on Tuesday morning, reports said.\

The identity of the hackers was not known, a government statement said.  The incident came on the anniversary of the start of the 1950-53 Korean War, which divided the Korean peninsula.

"The government can confirm a cyber attack by unidentified hackers that shut down several sites including the Blue House," the Science Ministry said in a statement, referring to the presidential office. The website for the office for Government Policy Co-ordination was also affected by the attack, as were some media servers, the ministry said.

According to reports, messages praising North Korean leader Kim Jong-un and claiming that hacking collective Anonymous was responsible were left on the hacked websites. However, Anonymous denied any involvement on its official Twitter account, AFP news agency reported [....]