Hackers have apparently broken into at least two of North Korea's government-run online sites.
The North's Uriminzokkiri Twitter and Flickr accounts stopped sending out content typical of that posted by the regime in Pyongyang, such as photos of North's leader Kim Jong Un meeting military officials.
Instead, a picture posted today on the North's Flickr site shows Kim's face with a pig-like snout and a drawing of Mickey Mouse on his chest. Underneath, the text reads: "Threatening world peace with ICBMs and Nuclear weapons/Wasting money while his people starve to death."
Another posting says "We are Anonymous" in white letters against a black background.
Anonymous is a name of a hacker activist group. A statement purporting to come from the attackers and widely circulated online said that they had compromised 15,000 user records hosted on Uriminzokkiri.com and other websites.
The authenticity of the statement could not be confirmed, but the North's official website did not open today.
Tweets on the North's Twitter account said "Hacked" followed by a link to North Korea-related websites. One tweet said "Tango Down" followed by a link to the North's Flickr page.
North Korea opened its Twitter account in 2010. It has more than 13,000 followers.
The North uses the social media to praise its system and leaders and also to repeat commentaries sent out by North's official Korean Central News Agency.
Tensions have been high in recent days between North and South Korea, and the North's military warned today that it had been authorised to attack the US.
North Korea is angry about sanctions against its nuclear program and joint military drills between the US and South Korea.