Some official North Korean Internet and social media sites appeared Thursday to have been hacked , possibly by the hacker collective Anonymous . The hacking -- including an image skewering North Korean leader Kim Jong Un on an official Flickr account -- comes amid rising tensions between North Korea and several other countries including the United States . The North Korean government website Uriminzokkiri.com was down Thursday morning , and the official @ uriminzok Twitter account -- also apparently tampered with -- has messages claiming that Uriminzokkiri , the Flickr site and other North Korean sites have been hacked . Among the pictures on the Flickr account Thursday : A `` wanted '' poster with an image showing Kim with a pig 's ears and nose . The poster accuses Kim of `` threatening world peace with ICBMs and nuclear weapons . '' Another image reads : `` We are Anonymous . '' On the Twitter account , the usual image atop the page was replaced with one that reads `` tango down '' -- military slang that has been appropriated by hackers to say they have interrupted service to a website . The image also shows dancers wearing Guy Fawkes masks . The mask is a favorite symbol of the hacker collective . If it is the work of Anonymous , it would be appear to be just the latest attack by the group against North Korean sites . Last week , Anonymous , upon leaking account information from Uriminzokkiri.com , announced it would continue to hack North Korean sites if the government did n't `` stop making nukes and nuke-threats , '' according to CNET . The group also demanded the resignation of Kim , democracy in North Korea , and uncensored Internet access for all North Koreans , CNET reported . Known for its DDOS , or distributed denial of service , attacks that take websites offline , Anonymous has taken up a number of causes . It had a hand in organizing and agitating in the Occupy movement throughout 2011 . It also is known for defending WikiLeaks ' Julian Assange and Assange 's assertion that all information should be freely available on the Internet . The hacker collective is an amorphous group that takes pride in not having a single leader or spokesperson , which makes claims by the group difficult to verify . READ MORE : North Korea 's threats : Five things to know . READ MORE : South Korea says hacking not from Chinese address .
Attack has hallmarks of hackers collective Anonymous . Apparent hackings come after Anonymous demands North Korean leader 's resignation . Official North Korean Flickr account shows image skewering Kim Jong Un .