SEOUL, South Korea - Hackers apparently broke into at least two of North Korea's government-run online sites Thursday, as tensions rose on the Korean Peninsula.

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 with military officials.

Instead, a picture posted Thursday 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 couldn't be confirmed, but the North's official website did not open Thursday.

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 Thursday that it had been authorized to attack the U.S. North Korea is angry about sanctions against its nuclear program and joint military drills between the U.S. and South Korea.

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The North Korean government on Twitter: http://www.twitter.com/uriminzok

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  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un waves at military officers after inspecting the Wolnae Islet Defense Detachment, North Korea, near the western sea border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, confers with military officers at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea border in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)

  • In this undated photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un, second left, watches sturgeons in a pond at the Ryongjong Fish Farm in South Hwanghae, southwestern North Korea. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un rides on a boat, heading for the Wolnae Islet Defense Detachment, North Korea, near the western sea border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un, third left, looks at South's western border island of Baengnyeong during his visit to the Wolnae Islet Defense Detachment, North Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, is welcomed by military personnel at a military unit on Jangjae islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, walks with military personnel as he arrives for a military unit on Mu Islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, uses binoculars to look at the South's territory from an observation post at the military unit on Jangjae islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, with military officials, gets a ride on a boat on his way to a military unit on Jangjae Islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) meeting with family of a soldier as he inspects Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) inspecting Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) waving to soldiers from a wooden boat as he inspects the Mu Islet Hero Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) meeting with family of a soldier as he inspects Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) inspecting Jangjae Islet near from South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) inspecting the Mu Islet Hero Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) posing with soldiers and their family members as he inspects Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)