Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Problem:Two South Korean lawmakers said Tuesday they were told by intelligence officials that two associates of North Korean leader Kim Jong Un's powerful uncle were executed last month. They said the uncle has not been seen publicly since then, indicating he may have been dismissed. 
  
 In this Tuesday, Aug. 14, 2012 file photo provided by China's Xinhua News Agency, Jang Song Thaek, North Korea's vice chairman of the powerful National Defense Commission, attends the third meeting on... (Associated Press) 
  
 Although Jang Song Thaek has reportedly been purged in the past, only to return to power, there was no official word from North Korea about his fate. South Korean intelligence officials have erred previously in predicting changes in the secretive North, and senior North Korean officials occasionally disappear from state media reports and then reappear. 
  
 Jang was last seen in North Korean media on Nov. 6. South Korea's spy agency, the National Intelligence Service, wouldn't confirm the two lawmakers' details about Jang, which came in a closed-door intelligence briefing. One of the lawmakers, Jung Chung-rae, said the NIS didn't tell him how it obtained the information. 
  
 The other lawmaker, Cho Wonjin, said the spy agency reported that North Korean authorities were investigating corruption allegations involving Jang's aides. 
  
 Jang is married to former leader Kim Jong Il's sister. He was seen as a powerful influence as young leader Kim Jong Un consolidated power after his father Kim Jong Il's death in December 2011. He walked by Kim Jong Un's side as a hearse carried Kim Jong Il's body through Pyongyang. 
  
 Jang holds a slew of top posts, including vice chairmanship of the powerful National Defense Commission and membership in the ruling Workers Party's political bureau. Jang has also been a frequent companion of Kim Jong Un on his tours around the country, as he was for Kim Jong Il. He has also been seen as a leading economic policy official. ||||| Image copyright Reuters Image caption Many observers saw Mr Chang as having a major influence on Kim Jong-un 
  
 A powerful uncle of North Korean leader Kim Jong-un has been removed from his post, South Korean media reports say. 
  
 Citing South Korea's intelligence agency, they say Chang Song-thaek, 67, lost his position as vice-chairman of the North's top military body. 
  
 Two close aides were also executed for corruption, according to the reports. 
  
 If confirmed, Mr Chang's removal would be the biggest upheaval in North Korea's leadership since Mr Kim succeeded his father, analysts say. 
  
 Analysis The reports attributed to South Korea's spy agency are difficult to verify. The agency has a patchy record in predicting North Korea's internal changes, and there is little scope to assess the evidence behind the claim. Chang Song-thaek is Kim Jong-un's uncle by marriage. As such, his influence over the leadership is independent from his senior military and political positions. Mr Chang's prestige has increased since the 2011 transition. He is seen as an economic reformer, and is regularly tasked with handling talks with China, Pyongyang's only major ally. His removal, if true, would be a dramatic change, but much would also depend on the reason for his dismissal. If medical problems led to his temporary disappearance from the limelight, this might leave him with great unofficial influence. Political differences or disloyalty would signal a far more serious shift. Either way, like many reports about North Korea's internal politics, the truth of this one may take a long time to emerge. 
  
 Kim Jong-un took over after Kim Jong-il died in 2011. 
  
 The latest reports emerged from an intelligence briefing given to South Korean lawmakers. 
  
 The National Intelligence Service (NIS) made the assessment based on information provided by multiple sources, the South's Yonhap news agency said. 
  
 It also quoted the intelligence service as saying two of Mr Chang's closest associates had been executed in public in late November. 
  
 'Power behind Kim' 
  
 The BBC's Lucy Williamson in Seoul says the reports are difficult to verify, and South Korea's spy agency has been proven wrong before. 
  
 But if true, the development would mark a significant shift, she adds. 
  
 Mr Chang is married to Kim Jong-il's sister. 
  
 He has often been pictured beside the elder Kim's son Kim Jong-un and was seen by some observers as the power behind him. 
  
 Mr Chang climbed through the ranks of the secretive leadership of North Korea's Korean Workers' Party (KWP) in the 1970s. 
  
 In 1992, he was elected to the party's Central Committee. But, despite his senior status, he has been targeted by purges in the past. 
  
 Chang Song-thaek Image copyright Reuters Born 1946; marries Kim Jong-il's sister in 1972 
  
 Joins Korean Workers' Party administrative ranks in 1970s 
  
 Elected to Central Committee in 1992 
  
 Sidelined in 2004, but rehabilitated in 2006 
  
 2011: Gets top military post under Kim Jong-un 
  
 Nov 2013: Reportedly dismissed Profile: Chang Song-taek Secretive 'first family' 
  
 In 2004, despite his place in the Kim family, he disappeared from public view. 
  
 One report at the time, citing South Korean intelligence, said Mr Chang had been placed under house arrest. 
  
 Others suggested he had been sent for "re-education". However, two years later he appeared to have been reinstated. 
  
 He was regarded as an economic reformer and a major influence on Kim Jong-un. 
  
 He held key positions in both the KWP and the National Defence Commission. 
  
 Apart from chronic economic problem, North Korea is involved in a protracted stand-off with its neighbours and Western powers over its nuclear weapons programme. 
  
 Tensions between the two Koreas rose after the North's third nuclear test in February. 
  
 Angered by expanded UN sanctions and annual US-South Korea military drills, Pyongyang threatened attacks on Japanese, South Korean and US military targets in the region. |||||
Solution:
If reports from the South are correct, North Korea is seeing a major change in its leadership. Kim Jong Un's uncle, Jang Song Thaek, has reportedly been fired from his role as vice chairman of the country's powerful National Defense Commission, per South Korea's spy agency. Yonhap reports that Jang "is widely regarded as the most influential figure in North Korea after Kim"; some considered the 67-year-old to be the "power behind" Kim, the BBC reports. He was last seen in public Nov. 6, and made his last appearance with Kim on Oct. 10. It's unclear why he may have fallen out of favor. South Korea's National Intelligence Service further says a number of sources have confirmed that two of Jang's aides were publicly executed over corruption last month. Jang has apparently faced disagreements with fellow leaders before: Reports in 2004 said he was under house arrest or facing "re-education," but he apparently returned to power two years later. Jang is married to Kim Jong Il's sister, though Yonhap cites reports stating he and his wife have grown apart. As for his relationship with Kim Jong Un, he walked by the leader's side as a hearse carried Kim Jong Il's body through Pyongyang, notes the AP. But "compared with 106 appearances made together the leader in 2012, he only accompanied Kim on 52 occasions for the whole of this year," says a South Korean official.