Jang was executed shortly after a special military trial, media reported.

In a viciously-worded attack, the regime accused Jang of betraying the trust of both Kim Jong-Un and his father Kim Jong-Il, saying he had received "deeper trust" from the younger leader in particular.

The regime accused him of attempting to stand in the way of Kim Jong-Un's succession, according to a report. Jang, who was married to the sister of the late Kim Jong-Il, played a key role in cementing the leadership of the inexperienced Kim.

But analysts say the 67-year-old's power and influence had become increasingly resented by his nephew, who is aged around 30. Jang, seen as Kim's political regent and the country's unofficial number two, had earlier been stripped of all posts and titles, with the regime accusing him of corruption and building a rival power base.

State TV this week showed photos of Jang being dragged out of his seat at a meeting by two officers, in an extremely rare public humiliation of a figure who was then demonized as a drug-taking womaniser. South Korean President Park Geun-Hye on Tuesday accused Kim Jong-Un of resorting to extreme violence to 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, according to her office. The Kim family has ruled for six decades with an iron fist, regularly purging those showing the slightest sign of dissent. Most are executed or sent to prison camps.

Analysts warn Jang's ouster, the biggest political upheaval since Jong-Un took power, may cause significant instability even in the world's most tightly controlled nation.

(Agencies)

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