North Korean leader Kim Jong-un and his uncle Jang Song-thaek attend a military parade in 2012. (Reuters)

In what has been described as extreme brutality of the North Korean regime, the country's current ruler Kim Jong-un has executed his uncle, Jang Song-thaek.

The once-powerful uncle of Jong-un and considered the strong man of North Korea, Jang was executed for treason, the state media KCNA announced, alleging that Thaek attempted to "overthrow the state".

Jang, 67, was killed just days ahead of the second death anniversary of Kim Jong Il, the father of Jong-un.

"If confirmed, this is another example of the extreme brutality of the North Korean regime," the White House said in a statement.

Before his downfall and death, Jang was often pictured beside Jong-un. He was married to the aunt (Kim Jong II's younger sister) of Kim and was known as his nephew's mentor or key policy adviser ever since Jong-un came to power upon his father's death in 2011.

The North Korean state media called Jang "worse than a dog" in its report announcing his execution.

China's President Hu Jintao (R) shakes hands with Jang song-thaek, in Beijing, August 17, 2012. Thaek supported Chinese-style economic reforms and was an important link between Pyongyang and Beijing. (Reuters)
China's President Hu Jintao (R) shakes hands with Jang song-thaek, in Beijing, 17 August, 2012. Thaek supported Chinese-style economic reforms and was an important link between Pyongyang and Beijing. (Reuters)

North Korea announced in early December that Jang had been removed from his military post on charges of corruption, drug use, gambling, womanising and generally leading a "dissolute and depraved life".

It also emerged that two of the aides of Jang had been executed.

According to state media, Jang admitted his crimes in court and a death sentence was immediately executed.

Analysts view Jang's execution as a move by Kim to strengthen his own power but fear that his sudden fall from grace and death could lead to instability in the region.

Kim Jong-un and Jang Song-thaek accompany the hearse carrying the coffin of late North Korean leader Kim Jong-il during his funeral procession in Pyongyang. (Reuters)
Kim Jong-un and Jang Song-thaek accompany the hearse carrying the coffin of late North Korean leader Kim Jong-il during his funeral procession in Pyongyang. (Reuters)
Jang Song-thaek mentored Kim Jong-un when he became the supreme leader two years ago and was pictured alongside him often. (Reuters)
Jang Song-thaek mentored Kim Jong-un when he became the supreme leader two years ago and was pictured alongside him often. (Reuters)
A man walks past televisions showing reports on the execution of Jang Song Thaek at an electronic store in Seoul December 13, 2013. (Reuters)
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