U.S. President Donald Trump's former campaign manager Paul Manafort turned himself in to federal authorities Monday amid an ongoing probe into alleged Russian meddling in the 2016 presidential campaign.

The FBI confirmed that Manafort had turned himself in at 8:15 AM local time, but could provide no other details surrounding the case.

The indictment against Manafort lays out 12 counts including conspiracy against the United States, conspiracy to launder money, acting as an unregistered foreign agent and several charges related to failing to report foreign bank and financial accounts. The indictment alleges that they moved money through hidden bank accounts in Cyprus, St. Vincent and the Grenadines and the Seychelles. In total, more than $75 million flowed through the offshore accounts. Manafort is accused of laundering more than $18 million, according to the indictment.

Manafort and a former business associate, Rick Gates, had been told to surrender to federal authorities, the New York Times said earlier Monday.

A grand jury approved the first charges in the federal investigation into Russian meddling in the 2016 U.S. election, U.S. media reported Friday.

Ex-FBI director Robert Mueller was appointed in May to lead the investigation into Russian efforts to influence the 2016 election and related matters. The probe has extended into alleged Russian contacts with Trump's 2016 campaign team.