Former French President Nicolas Sarkozy was placed in custody on Tuesday as part of an investigation that he received millions of euros in illegal financing from the regime of the late Libyan leader Moammar Gadhafi.

A judicial source with direct knowledge of the case told The Associated Press that Sarkozy was being held at the Nanterre police station, west of Paris. The person spoke on condition of anonymity because he was not authorized to discuss the matter publicly.

Sarkozy and his former chief of staff have denied wrongdoing in the case, which involves funding for his winning 2007 presidential campaign.

Though an investigation has been underway since 2013, the case gained traction some three years later when French-Lebanese businessman Ziad Takieddine told the online investigative site, Mediapart, that he delivered suitcases from Libya containing 5 million euros ($6.2 million) in cash to Sarkozy and his former chief of staff Claude Gueant.

A lawyer for Sarkozy did not immediately respond to a message from the AP seeking comments.

Investigators are examining claims that Gadhafi's regime secretly gave Sarkozy 50 million euros overall for the 2007 campaign. Such a sum would be more than double the legal campaign funding limit at the time of 21 million euros. In addition, the alleged payments would violate French rules against foreign financing and declaring the source of campaign funds.

It is not the first time that Sarkozy faces legal troubles. In February 2016, he was handed preliminary charges by French magistrates for suspected illegal overspending on his failed 2012 re-election campaign and ordered to stand trial.

(AP)