Kim Jong-un is believed to have ordered the total elimination of his uncle’s biological relatives.

The terrifying purge reportedly started straight after Jang Sung-Taek’s execution and is to demonstrate the Kim Jong Un's "decisiveness."

The North Korean leader is said to be clamping down on any type of mutiny with a brutal iron fist.

jang song thaek

Television moitors displayed at the Yongsan electronic market shows the news of Jang Song-thaek's excution in Seoul

“Multiple” sources in Pyongyang told the Seoul-based Yonhap news agency that the executed relatives include Jang's sister Kye-sun, her husband and ambassador to Cuba, Jon Yong-jin, the ambassador to Malaysia, Jang Yong-chol, who is Jang's nephew, as well as his two sons, the sources said.

Underage sons and daughters and even grandchildren of the abovementioned officials were also reportedly killed.

Yonhap’s source said that some victims put up resistance while being dragged out of their apartments and were shot dead “in front of other people”.

Jang, a once powerful North Korean military general, was executed last month as divisions between him and his nephew Kim widened.

Officials referred to Jang as "worse than a dog" and "human scum" in his announcement of his execution, which he said was for treachery and betrayal.

South Korean President Park Geun-Hye has already said the South fears a wave of purges would follow the execution, as 30-year-old Kim seeks to further cement his leadership.

"North Korea is now engaged in a reign of terror while carrying out a massive purge to consolidate the power of Kim Jong-Un," she told a cabinet meeting.

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  • North Korean leader Kim Jong Un, center, attends an inauguration ceremony for a cemetery for Korean War veterans on Thursday, July 25, 2013 in Pyongyang, North Korea marking the 60th anniversary of the signing of the armistice that ended hostilities on the Korean peninsula. (AP Photo/Kyodo News)

  • North Korean leader Kim Jong Un, center, walks through a cemetery for Korean War veterans on Thursday, July 25, 2013 in Pyongyang, North Korea marking the 60th anniversary of the signing of the armistice that ended hostilities on the Korean peninsula. (AP Photo/Kyodo News)

  • North Korean leader Kim Jong-Un (R) arrives to attend the inauguration of a Korean war military cemetery in Pyongyang on July 25, 2013. (Ed Jones/AFP/Getty Images)

  • North Korean soldiers applaud during the arrival of the country's leader Kim Jong-Un at the inauguration of a Korean war military cemetery in Pyongyang on July 25, 2013. (Ed Jones/AFP/Getty Images)

  • North Korean leader Kim Jong-Un (L) looks at tombstones during the inauguration of a Korean war military cemetery in Pyongyang on July 25, 2013. (Ed Jones/AFP/Getty Images)

  • North Korean leader Kim Jong-Un (2nd R) arrives to attend the inauguration of a Korean war military cemetery in Pyongyang on July 25, 2013. (Ed Jones/AFP/Getty Images)

  • North Korean leader Kim Jong-Un (C) arrives to attend the inauguration of a Korean war military cemetery in Pyongyang on July 25, 2013. (Ed Jones/AFP/Getty Images)

  • North Korean leader Kim Jong Un arrives at the cemeteries of fallen fighters of the Korean People's Army (KPA) on Thursday, July 25, 2013 in Pyongyang, North Korea as part of ceremonies marking the 60th anniversary of the signing of the armistice that ended hostilities on the Korean peninsula. (AP Photo/Wong Maye-E)

  • North Korean leader Kim Jong Un, center, salutes during an opening ceremony for a cemetery for Korean War veterans on Thursday, July 25, 2013 in Pyongyang, North Korea marking the 60th anniversary of the signing of the armistice that ended hostilities on the Korean peninsula. (AP Photo/David Guttenfelder)