An international coalition of media outlets on Sunday published what it said was an extensive investigation into the offshore financial dealings of the rich and famous, based on data and internal documents from a Panama-based law firm, Mossack Fonseca.
The International Consortium of Investigative Journalism, a nonprofit organisation based in Washington, said the cache of 11.5 million records, which was provided by an anonymous source, detailed the offshore holdings of a dozen current and former world leaders, as well as businessmen, criminals, celebrities and sports stars.
The Associated Press wasn't immediately able to verify the allegations made in articles that were published by the more than 100 news organisations around the world involved in the investigation.
Among the countries with past or present political figures named in the reports are Iceland, Ukraine, Pakistan, Argentina, Saudi Arabia and Russia.
The Guardian newspaper, which took part in the investigation, published a video on its website late Sunday showing an interview with Iceland's prime minister, Sigmundur David Gunnlaugsson.
During the interview with Sweden's SVT television, the prime minister was asked about a company called Wintris, to which he responded by insisting that its affairs are above board and calling the question "completely inappropriate," before breaking off the interview.
The office of Argentina's president, Mauricio Macri, confirmed on Sunday that the business group owned by his family set up Fleg Trading Ltd., an offshore company based in the Bahamas.
But it said Macri himself had no shares in Fleg and never received income from it.
Macri's office commented after La Nacion, an Argentine national newspaper, reported that he and his family had links to Fleg.
Mossack Fonseca did not immediately respond to an AP request for comment.