Story highlights Investigators in Ukraine have alleged Yanukovych and members of his party ran a corrupt regime

Ex-Trump campaign chairman Paul Manafort has not been the focus of the probe

Washington (CNN) FBI and Justice Department prosecutors are conducting an investigation into possible US ties to alleged corruption of the former pro-Russian president of Ukraine, including the work of Paul Manafort's firm, according to multiple US law enforcement officials.

The investigation is broad and is looking into whether US companies and the financial system were used to aid alleged corruption by the party of former president Viktor Yanukovych.

Manafort, who resigned as chairman of Donald Trump's campaign Friday, has not been the focus of the probe, according to the law enforcement officials. The investigation is ongoing and prosecutors haven't ruled anything out, the officials said.

The probe is also examining the work of other firms linked to the former Ukrainian government, including that of the Podesta Group, the lobbying and public relations company run by Tony Podesta, brother of Clinton campaign chairman John Podesta.

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