Media playback is unsupported on your device Media caption The BBC's Damien Grammaticus in Beijing says the decision to investigate sends "significant" messages to both the public and politicians 
 
 China's former security chief Zhou Yongkang is being investigated for suspected "serious disciplinary violation", state media say. 
 
 The news confirms rumours about the hugely powerful former minister, who has not been seen in public for months. 
 
 Mr Zhou headed China's Ministry of Public Security and was a member of the top decision-making body, the Politburo Standing Committee. 
 
 The move to target him will send shockwaves through the political elite. 
 
 With today's public disgrace of such a senior figure, Xi Jinping is signalling that his campaign is different 
 
 He is the most senior Chinese official to be investigated since the Gang of Four - which included the wife of late leader Mao Zedong - in the early 1980s. 
 
 Zhou Yongkang retired in late 2012, as Xi Jinping took over from Hu Jintao as the Communist Party leader and China's president. 
 
 Since the transition, Mr Xi has introduced a wide-ranging crackdown on corruption within the party, warning graft could threaten the organisation's very survival. 
 
 Bo Xilai ally 
 
 In a brief statement, state-run Xinhua news agency said the investigation would be conducted by the Communist Party's corruption watchdog, the Central Commission for Discipline Inspection. 
 
 No timescale was given for the probe, which has been widely expected. 
 
 Several individuals believed to have had close ties to Mr Zhou have also been targeted in corruption investigations in recent months. 
 
 Damian Grammaticas, BBC News, Beijing 
 
 So the tiger-trap has been sprung. What does it mean? In his anti-corruption drive General Secretary Xi Jinping has publicly promised to hunt "tigers and flies", Communist Party officials however powerful or lowly who have lined their own pockets. 
 
 Now he has bagged a tiger. No such senior leader has been brought down by the party in more than 30 years. In truth Mr Zhou was a toothless tiger, retired, increasingly isolated, a spent political force. For months rumours have abounded that the former security chief was being probed. His family, associates and political allies have been caught in the dragnet of corruption investigations. 
 
 But this is about more than tackling corruption. 
 
 With this move Xi Jinping has signalled he feels powerful enough to take down any figure, to neutralise any rival networks competing for power inside the Communist Party. He is asserting his own power and authority. And he is showing he wishes to govern China in the old way, not by opening the party to more outside scrutiny over oversight, but by the use of brute political force, the party policing itself, controlled tightly from the top. 
 
 Mr Zhou's career saw him head both the ministry charged with overseeing domestic security and China's largest energy company, the China National Petroleum Corporation (CNPC). 
 
 He was also the party's top official in Sichuan province. 
 
 Allies of his from all three areas are now the subject of various investigations. 
 
 Only a handful of people serve on the Politburo Standing Committee (in Mr Zhou's time nine, currently the number is seven) and they are seen as the most powerful individuals in China. 
 
 Zhou Yongkang was also an ally of Bo Xilai, the one-time high-flying former Chongqing party chief who was jailed last year. 
 
 In initial reactions observed on Weibo, China's Twitter-like micro-blogging platform, netizens appeared to praise the announcement. 
 
 Thumbs-up emoticons, "Got him!" and "Good job!" were just some of the more popular responses. 
 
 Many also made reference to "tigers", a reference to Mr Xi's promise to include high-ranking officials in his anti-corruption campaign. 
 
 "Now that is what I call an old tiger. Good job Mr Xi," said one user. "This is just one tiger out of many, to catch tigers one must have determination, don't stop now!" said another. 
 
 It was not clear to what extent officials were censoring negative comments, as has been done in the past. ||||| Disclosures show how havens such as British Virgin Islands hide links between big business and relatives of top politicians 
 
 The eight members of China’s Communist party elite whose family members used offshore companies are revealed in the Panama Papers. 
 
 The documents show the granddaughter of a powerful Chinese leader became the sole shareholder in two British Virgin Islands companies while still a teenager. Jasmine Li had just begun studying at Stanford University in the US when the companies were registered in her name in December 2010. Her grandfather Jia Qinglin was at that time the fourth-ranked politician in China. 
 
 Other prominent figures who have taken advantage of offshore companies include the brother-in-law of the president, Xi Jinping, and the son-in-law of Zhang Gaoli, another member of China’s top political body, the politburo standing committee. 
 
 
 
 Facebook Twitter Pinterest Jasmine Li (centre) at the Crillon debutante ball for Vanity Fair magazine in Paris, France. Photograph: Jonathan Becker/Contour by Getty Images 
 
 They are part of the “red nobility”, whose influence extends well beyond politics. Others include the daughter of Li Peng, who oversaw the brutal retaliation against Tiananmen Square protesters; and Gu Kailai, wife of Bo Xilai, the ex-politburo member jailed for life for corruption and power abuses. 
 
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 The relatives had companies that were clients of the offshore law firm Mossack Fonseca. There is nothing in the documents to suggest that the politicians in question had any beneficial interest in the companies connected to their family members. 
 
 
 
 Since Monday, China’s censors have been blocking access to the unfolding revelations about its most senior political families. There are now reports of censors deleting hundreds of posts on the social networks Sina Weibo and Wechat, and some media organisations including CNN say parts of their websites have been blocked. 
 
 
 
 The disclosures come amid Xi Jinping’s crackdown on behaviour that could embarrass the Communist party. 
 
 Two more well-connected figures – the brother of former vice-president Zeng Qinghong and the son of former politburo member Tian Jiyun – are directors of a single offshore company. They have previously been linked in a court case that highlighted how some Chinese “princelings” have used political connections for financial gain. 
 
 Facebook Twitter Pinterest Jia Qinglin is Jasmine Li’s grandfather. Photograph: Scott Barbour/Getty Images 
 
 They have emerged from the internal data of the offshore law firm Mossack Fonseca, obtained by the German newspaper Süddeutsche Zeitung and shared by the International Consortium of Investigative Journalists (ICIJ) in Washington with the Guardian, the BBC and other media. 
 
 China and Hong Kong were Mossack Fonseca’s biggest sources of business, with clients from these jurisdictions linked to a total of 40,000 companies past and present. About a quarter of these are thought to be live: in 2015, records show the firm was collecting fees for nearly 10,000 companies linked to Hong Kong and China. The Mossack Fonseca franchise now has offices in eight Chinese cities, according to its website. 
 
 There are many legitimate reasons to use offshore companies. Individuals living in multiple jurisdictions find them convenient, and in China they are often used as a way to attract and safeguard investment from overseas. While there is no indication of any wrongdoing, the leaks draw unwelcome attention to the wealth of leaders’ families. In some cases, they show how secrecy havens are being used to create and hide potentially lucrative connections between big business and politics in the world’s second-largest economy. 
 
 Even as officials advertise their zeal in targeting corruption by hunting assets overseas and checking on the relatives of officials, they remain highly sensitive to the disclosure of the business interests of top leaders’ families. 
 
 In 2014, the websites of the Guardian and several other media outlets were blocked for several months after revealing such offshore holdings. Xi’s brother-in-law Deng Jiagui and Li’s daughter Li Xiaolin were named in those leaks, too. The new documents therefore indicate multiple offshore holdings. 
 
 Facebook Twitter Pinterest Tian Jiyun is a former politburo member whose son is linked to an offshore company. Photograph: Robyn Beck/AFP/Getty Images 
 
 Xi’s harsh anti-corruption drive has brought down a host of high-ranking figures. In December, he urged politburo members “to strictly educate and supervise their children and other family members as well as subordinates, and to rectify their problems in a timely manner”. He urged members of the 25-strong body to not only have integrity but “stay away from vulgar taste and set good examples for other cadres and the general public”. In other words, avoiding wrongdoing is not enough, impressions count, too. 
 
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 Xi’s daughter, Xi Mingze, studied at Harvard but kept a low profile, living under an assumed name. In contrast, Jasmine Li came to public attention when Vogue featured her in a floor-length Carolina Herrera gown at the Hotel de Crillon’s annual debutante ball in Paris in 2009. She was presented alongside Lady Kitty Spencer, niece of Diana, Princess of Wales, and the daughter of Clint Eastwood. 
 
 The following year, shortly after beginning a course in international relations at Stanford, she was recorded as the sole shareholder of two entities registered in the British Virgin Islands, Harvest Sun Trading Limited and Xin Sheng Investments Limited. These companies established at least two businesses in Beijing, with a combined registered capital of £200,000, described on the register as specialising in “investment and consulting”. 
 
 The leaked data reveals Harvest Sun was incorporated in July 2009 and that its first shareholder was someone apparently unconnected to Li: a 57-year-old Hong Kong entrepreneur known as the King of Watches. 
 
 Cheung Yu Ping’s firm, Hengdeli, is valued at $470m on the Hong Kong stock exchange and is one of the world’s biggest sellers of Swiss watches by volume. It supplies pieces by Cartier and TAG Heuer to China’s new rich. 
 
 Facebook Twitter Pinterest Li Peng, the father of Li Xiaolin. Photograph: Sportsphoto/Allstar 
 
 In December 2010, Cheung passed his shares in Harvest Sun to Li for just $1. A lawyer for Cheung said the company had contained no assets at the time of transfer. He explained: “Our client had no relationship with Ms Li, who was introduced to our client by some business partners for taking up the company without the need to set up another shell company herself. Our client considered the consideration of the transfer reasonable as the company was only a shell company with no assets inside.” 
 
 Li did not respond to requests for comment. 
 
 Politically exposed persons – or PEPs, public officials, their families and known associates – are considered high risk clients by those providing offshore services. Mossack Fonseca said: “We have duly established policies and procedures to identify and handle those cases where individuals either qualify as PEPs or are related to them … Enhanced due diligence procedures apply in these cases.” 
 
 The president’s brother-in-law 
 
 Facebook Twitter Pinterest Xi Jinping attends a meeting with foreign experts at the Great Hall of the People in Beijing. Photograph: Ed Jones/AFP/Getty Images 
 
 Xi Jinping’s brother-in-law Deng Jiagui was a shareholder in two BVI companies, Wealth Ming International and Best Effect Enterprises. 
 
 Deng appeared on the shareholder registers of both companies in September 2009. They both existed for roughly 18 months before being closed in April 2011 and October 2010 respectively. 
 
 The previous leak of offshore documents revealed Deng owned a 50% stake in the BVI-incorporated Excellence Effort Property Development. Ownership of the remainder of the company has been traced back to two Chinese property tycoons. 
 
 Deng is married to Xi’s older sister, and together they built a fortune through investments in property and natural resources. In 2012, they were reported to hold stakes in companies with total assets of $376m, and an indirect 18% share in a minerals company worth $2bn. Since Xi became president, they have pulled out of many of their investments. 
 
 Thanks to his close connection to the centre of Chinese power, Deng qualifies as a PEP. Banks, registered agents and professionals such as lawyers are obliged to carry out detailed checks on the source of funds when managing money for politicians, public officials, their families and close associates. 
 
 Deng was the named shareholder and had given the firm his Hong Kong identity papers. But Mossack Fonseca’s files did not list him as a PEP, raising questions about whether detailed checks were made on what his offshore vehicles were used for. Deng did not respond to requests for comment. 
 
 The power queen 
 
 Facebook Twitter Pinterest Li Xiaolin in March 2011 in Beijing. Photograph: Feng Li/Getty Images 
 
 Former premier Li Peng is known by his detractors as the “butcher of Beijing” for his part in the bloody crackdown on the 1989 Tiananmen Square protests. In 1994, a BVI company called Cofic Investments Limited, ultimately owned by his daughter Li Xiaolin, was incorporated. 
 
 Her fortune has been estimated at $550m, and she has made a name as China’s “power queen” after a career spent running electricity-generating businesses. She is vice-president of state-owned power group China Datang Corporation. 
 
 Li is noted in China for conspicuous consumption – her appearance in a pink Pucci trouser suit at the annual meeting of a top government advisory body prompted a widely shared social media post that suggested the 12,000 yuan (£1,300) price tag was equivalent to warm clothes for 200 poor children. 
 
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 Previous ICIJ investigations have linked her to two other BVI companies, and to Swiss bank accounts. Li and her husband, Liu Zhiyuan, were revealed as the beneficiaries of five bank accounts that together held as much as $2.48m in 2006-07. 
 
 Li’s identity became known to Mossack Fonseca when BVI regulators asked for information about Cofic in 2015, and inquiries were made with the Geneva law firm that represented it. Cofic’s directors at this time were two partners in the firm, Charles-André Junod and Alain Bruno Lévy. Its shareholder, however, was a secretive Liechtenstein entity called Fondation Silo, whose beneficial owners were named by Junod as Li and her husband. 
 
 When asked about his clients, Junod sent their passports to Mossack Fonseca with the following explanation: “Regarding the source of funds, it is business profits: my clients have provided, through Cofic, services to other clients of my office who were exporting heavy industrial equipment from Europe to China.” 
 
 Cofic held a Swiss bank account at UBS and another with the asset manager Mirelis InvesTrust, the files show. Junod said: “In our activity, we have always been acting in full compliance with laws and regulations governing our profession.” 
 
 Li did not respond to requests for comment. 
 
 The Hong Kong lobbyists 
 
 Facebook Twitter Pinterest Zeng Qinghong, whose younger brother has been linked to tax havens. Photograph: Reuters/CORBIS 
 
 Zeng Qinghong was China’s vice-president until 2008. His younger brother, Zeng Qinghuai, is well known in Hong Kong, having worked there as an envoy for the ministry of culture. He was a consultant to Beginning of the Great Revival, a state-produced propaganda movie which, according to the New York Times, “exemplified the hand-in-glove relationship between business and politics”. Government offices and schools were ordered to buy tickets and any criticism was censored. State support ensured it was one of 2011’s top grossing films. 
 
 The Panama Papers reveal that Zeng Qinghuai is a director of a company called Chinese Cultural Exchange Association Ltd, registered first in the tiny South Pacific island of Niue, then in Samoa. He sits on the board alongside another princeling, Tian Chenggang, son of the former vice-premier and politburo member Tian Jiyun. 
 
 A 2012 court case, in which Tian Chenggang unsuccessfully sued a developer called Beijing Henderson Properties, shed new light on the business dealings of the red nobility. The court in Hong Kong heard that Tian and a company linked to Zeng had been separately engaged to lobby regulators on behalf of Henderson when it was under investigation for breaching foreign exchange regulations in 2006. An exchange of letters disclosed in court suggested Tian’s father had written to the regulators to plead leniency. In the event, the fine imposed was smaller than expected. 
 
 Companies linked to Zeng received fees of $2.1m and $650,000. Henderson rejected Tian’s demand for $5.5m, so Tian sued for the money but lost. The judge’s summing up said of him: “He tried to project an air of superiority … His attitude was contemptuous and disrespectful.” 
 
 Zeng and Tian did not respond to requests for comment. 
 
 
 
 The others 
 
 Facebook Twitter Pinterest Zhang Gaoli is one of China’s seven most powerful politicians. Photograph: How Hwee Young/EPA 
 
 Also in the data are Hu Dehua, the businessman son of Hu Yaobang, the Communist party’s general secretary ousted in 1987 because he was seen as too liberal – and, some sympathisers say, for his attempts to root out corruption among leaders’ families. Hu has interests in technology and energy, and is registered as sole shareholder of a BVI entity called Fortalent International Holdings. Hu did not respond to requests for comment. 
 
 The Hong Kong businessman Lee Shing Put is married to the adoptive daughter of Zhang Gaoli, who is China’s senior vice-premier. As a member of the politburo standing committee, he is one of the seven most powerful politicians in China. 
 
 
 
 His son-in-law Lee worked for Xinyi, a glass, plastics and solar power manufacturer founded by Lee’s father, but resigned in 2008, according to the company. He is listed as a shareholder in Sino Reliance Networks Corporation, now closed, Glory Top Investments and Zennon Capital Management. 
 
 At the time of his father-in-law’s elevation to the politburo, Lee, who did not respond to requests for comment, was a director of 17 Hong Kong companies, the South China Morning Post reported. 
 
 Panama Papers reporting team: Juliette Garside, Luke Harding, Holly Watt, David Pegg, Helena Bengtsson, Simon Bowers, Owen Gibson and Nick Hopkins ||||| BEIJING—China launched a formal investigation into one of the Communist Party's most senior figures, lifting a cloak of immunity that has shielded the country's highest ranks as President Xi Jinping made his boldest attempt yet to solidify power. 
 
 Zhou Yongkang, China's former domestic security chief and one of the nation's top nine leaders until he retired in 2012, will be investigated for "serious disciplinary...
– Chinese President Xi Jinping has made it his mission to eliminate corruption within the ruling Communist Party, and his latest target is the highest-ranking thus far. Zhou Yongkang is the former head of national security and an ex-member of the Politburo Standing Committee, which heads the party; he was among "the country's most feared leaders" before he retired in 2012, the AP notes. But he hasn't appeared publicly in months, the BBC reports, and now, state media say he's facing an investigation over a possible "serious disciplinary violation." Though unspecific, that language tends to refer to corruption, the Wall Street Journal notes. Zhou, a onetime ally of disgraced politician Bo Xilai, is the highest-ranking official to face investigation since the 1980s, when Mao Zedong's wife was among those targeted in an investigation, the BBC reports. Until now, such inquiries had avoided Politburo members, the Journal notes. Xi could face anger within the party over the probe, the paper adds, but it also points to the solidifying of his power, the BBC notes.