"We are aware of the reports and are reviewing them," Justice Department spokesman Peter Carr.
"While we cannot comment on the specifics of these alleged documents, the US Department of Justice takes very seriously all credible allegations of high level, foreign corruption that might have a link to the United States or the US financial system."
The comments came one day after the release of some 11.5 million documents by the International Consortium of Investigative Journalists, concerning some 214,000 offshore entities. The leaked documents came from Mossack Fonseca, a Panama-based law firm with offices in more than 35 countries.
France, Spain and Australia all opened legal probes Monday.
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Jubilee USA Network, a faith-based anti-poverty group, called for Congress to prevent the establishment of anonymous companies in the United States.
But whether or not these documents reveal substantive,
legitimate evidence of people thwarting monitors of the international financial system, the United States will continue to be a leading advocate of greater transparency in its financial system, Earnest said.
There are officials both at Treasury Department and Department of Justice who have responsibilities here.
The effective completion, or the effective implementation of those strategies by the Department of Treasury and the Department of Justice also rely on effective coordination with our partners around the world, he added.
"So there obviously is an opportunity for the US to use some of our leverage as a leader in this field and as the world's largest economy to bring about some of the changes that we would like to see. We have been doing that for a long time. Those efforts are only going to continue," Earnest said.
The latest investigation from the International Consortium of Investigative Journalists (ICIJ) zeroes in on the Panama-based law firm Mossack Fonseca, and is perhaps the starkest example yet of how financial secrecy helps fuel crime, corruption, and inequality that stifle development around the globe, said Financial Transparency Coalition.
"This latest leak, potentially the biggest ever, is another nail in the coffin for anonymous companies and secrecy jurisdictions," said Porter McConnell, Director of the Financial Transparency Coalition.
"From the South African mine workers' families whose death benefit was stolen to the Indonesian parent left unable to pay school fees to the Syrian people who lost their lives in bombing raids paid for via anonymous companies - crime, inequality, and violence are the inevitable result of the extreme financial secrecy available to the rich and powerful through firms like Mossack Fonseca. Ordinary people are no longer willing to pay the price," McConnell added.