US Treasury Department agents have obtained information about offshore financial transactions involving President Donald Trump's former campaign chairman, Paul Manafort, as part of a federal anti-corruption probe into his work in Eastern Europe, The Associated Press has learned.
Information about Manafort's transactions was turned over earlier this year to US agents working in the Treasury Department's Financial Crimes Enforcement Network by investigators in Cyprus at the US agency's request, a person familiar with the case said.
The Cyprus attorney general, one of the country's top law enforcement officers, was made aware of the American request.
A spokesman for Manafort did not immediately respond to questions from the AP.
Manafort, who was Trump's unpaid campaign chairman from March until August last year, has been a leading focus of the US government's investigation into whether Trump associates co-ordinated with Moscow to meddle in the 2016 campaign.
Federal prosecutors became interested in Manafort's activities years ago as part of a broad investigation to recover stolen Ukrainian assets after the ouster of pro-Russian President Viktor Yanukovych there in early 2014. No US criminal charges have ever been filed in the case.
It was not immediately clear what time period was covered under the government request for information about Manafort's financial transactions in Cyprus. Manafort was known to route financial transactions through Cyprus, according to records of international wire transfers obtained by the AP and public court documents filed in a 2014 legal dispute in the Cayman Islands.
In the 2014 case, Manafort used Cypriot shell companies as part of a nearly $US19 million ($A25 million) deal with Russian billionaire Oleg Deripaska to purchase Ukrainian cable television provider Black Sea Cable. Deripaska said that after taking the money, Manafort and his associates stopped responding to Deripaska's queries about how the funds had been used.
As part of their investigation, US officials were expected to look into millions of dollars' worth of wire transfers to Manafort. In one case, the AP found that a Manafort-linked company received a $US1 million ($A1.3 million) payment in October 2009 from a mysterious firm through the Bank of Cyprus. The $US1 million payment left the account the same day - split in two, roughly $US500,000 disbursements to accounts with no obvious owner.
There is nothing inherently illicit about using multiple companies as Manafort was doing. But it was unclear why he would have been involved with companies in Cyprus, known for its history of money laundering before joining the European Union, with unclear sources of the money flowing in to them and with such secrecy surrounding the firms' connections to Manafort.
A Treasury Department spokesman, Stephen Hudak, declined to answer the AP's questions about Manafort's records.
The White House said Trump had not been aware of Manafort's work on behalf of Deripaska, a close Putin ally with whom Manafort eventually signed a $US10 million annual contract beginning in 2006.
