The leak involves more than 11.5 million documents from the files of law firm Mossack Fonseca, based in the tax haven of Panama, revealing details of hundreds of thousands of clients in multiple jurisdictions.

Khulubuse Zuma is named as being authorised to represent Caprikat Limited‚ one of two offshore companies that controversially acquired oil fields in the Democratic Republic of Congo (DRC).

According to the documents, which News24 has perused, British Virgin Island tax authorities ordered the law firm to furnish further particulars about Zuma.

A letter, sent to Mossack Fonseca by a Financial Investigation Agency official, gave the law firm seven days to hand over Zuma’s details.

“You have not provided all of the information that was requested in Questions 1 and 2 of my letter. Specifically, you have not provided a copy of the due diligence in respect of the above referenced company,” it reads.

According to a report by the Centre for Public Integrity, which published the leaked papers, Mossack Fonseca decided to “end its relationship” with Zuma and Caprikat.

Khulubuse Zuma, a sports car collector and flashy socialite, was one of the men behind the collapse of Aurora's Pamodzi mines.

He and other directors were accused of siphoning off billions of rands which caused the mines to shut down, costing thousands of jobs.

Efforts to contact the Presidency were unsuccessful at the time of publishing.

The leaked data link at least 12 current and former heads of state and 128 other politicians to illicit financial transactions. Those implicated include Russian President Vladimir Putin, former Egyptian autocrat Hosni Mubarak and Syrian President Bashar al-Assad.

The documents were passed to German newspaper Suddeutsche Zeitung‚ which then shared them with the International Consortium of Investigative Journalists who shared them with 107 media organisations in 78 countries. The consortium and media organisations have been analysing the documents for more than a year.

The leaked 'Panama Papers' cover a period of almost 40 years, from 1977 until as recently as last December, and allegedly show that some companies domiciled in tax havens were being used for suspected money laundering, arms and drug deals, and tax evasion.

Britain's Guardian newspaper said the documents showed a network of secret offshore deals and loans worth $2 billion led to close friends of Russian President Vladimir Putin. Reuters couldn't independently confirm those details.

The Australian Tax Office (ATO) said on Monday it is investigating more than 800 wealthy clients of Mossack Fonseca.

“Currently we have identified over 800 individual taxpayers and we have now linked over 120 of them to an associate offshore service provider located in Hong Kong,” the Australian tax office said in a statement emailed to Reuters. It did not name the Hong Kong company.

The head of Mossack Fonseca has denied any wrongdoing but acknowledged his firm had suffered a successful but “limited” hack on its database.

The firm’s director, Ramon Fonseca, described the hack and leak as “an international campaign against privacy”.

Fonseca, who was a senior government official in Panama up until March, said in a telephone interview with Reuters on Sunday the firm, which specialises in setting up offshore companies, has formed more than 240 000 such companies and noted the “vast majority” of these have been used for “legitimate purposes.”

ATO Deputy Commissioner Michael Cranston said his office was working with the Australian Federal Police, the Australian Crime Commission and anti-money laundering regulator AUSTRAC to further cross-check the data from the documents.

“Some cases may be referred to the Serious Financial Crime Taskforce,” Cranston said in the statement.

The 800 individuals under investigation include some taxpayers who had previously been investigated and others who had reported themselves to the tax office under a voluntary disclosure initiative, which allowed people to come forward and avoid steep penalties and criminal charges and has since ended.

However, the ATO said those under investigation also included a large number of taxpayers who had not previously come forward.

New Zealand’s tax agency on Monday said it is “working closely” with its tax treaty partners to obtain full details of any New Zealand tax residents who may have been involved in arrangements facilitated by Mossack Fonseca.

John Nash, the New Zealand agency’s international revenue strategy manager, told Reuters in emailed comments that there is an “active compliance programme focused on those who engage in abusive offshore arrangements and don’t meet their tax obligations”.

Separately, media reports said the leaked data pointed to a link between a member of global soccer body Fifa’s ethics committee and a Uruguayan soccer official who was arrested last year as part of a wide-ranging US probe into corruption in the sport.

Fifa’s ethics committee said in a statement on Sunday that Juan Pedro Damiani, a member of the committee’s judgment chamber, was being investigated over a possible business relationship with fellow Uruguayan Eugenio Figueredo, one of the soccer officials arrested in Zurich last year.

Damiani told Reuters in Montevideo on Sunday that he broke off relations with Figueredo when the latter was accused of corruption.

News24; Reuters