The taskforce will investigate the leaked files to identify clients of the Panama firm suspected of money laundering and tax evasion.
British Prime Minister David Cameron was today to announce a new taskforce to deal with the so-called Panama Papers as pressure mounted over the handling of his own offshore finances.
The force will be led by the HMRC tax authority and the National Crime Agency, but is unlikely to spare Cameron from more scrutiny over his admission on Thursday that he bought and then sold shares in his late father's Bahamas-based offshore fund.
Cameron at first refused to comment on his father's fund, details of which emerged in the leak of documents from Panama law firm Mossack Fonseca, and admitted on Saturday he had mishandled the controversy.
The prime minister was to insist today that Britain has been at the "forefront of international action to tackle aggressive tax avoidance and evasion," according to a statement from the finance department, but the latest revelations appear to have undermined his claims to be leading the efforts.
A Yougov poll released on Thursday showed that Cameron was the second least trusted British politician on tax affairs, coming behind only his finance minister George Osborne.
The taskforce will investigate the leaked files to identify clients of the Panama firm suspected of money laundering and tax evasion, and will have a 10-million pound ($14-million, 12-million-euro) budget.
"There is clearly further to go and this taskforce will bring together the best of British expertise to deal with any wrongdoing relating to the Panama Papers," said Cameron.
The taskforce will report its findings "later this year", according to the statement.
Cameron said he would publish his tax returns and shouldered the blame for the row.
He earlier admitted he and his wife had held a stake in his father's Blairmore Holdings scheme. They bought the stake for 12,497 pounds in 1997 and sold it for 31,500 pounds, four months before he became prime minister in 2010.
He is believed to have paid tax on the dividends paid out by the trust, but not on the profits when sold.
"It has not been a great week. I know that I should have handled this better, I could have handled this better," he told his Conservative Party's spring forum in London on Saturday.
Hundreds of demonstrators gathered outside Downing Street on Saturday to call for his resignation.