SEOUL – Secret North Korean military documents revealing missile secrets have been obtained and will be released on June 25, international hacking collective ‘Anonymous’ claims, although experts remain skeptical of the group’s success.

“We will no longer put up with your threats towards world peace and the Republic of Korea,” the South Korean hackers said in a press release late on Wednesday evening, a copy of which was also posted on YouTube.

Anonymous Korea is planning ‘OpNorthKorea’, a coordinated cyber attack on North Korean computer networks it claims will be launched on June 25, the anniversary of the 1950-1953 Korean