Former French president Nicolas Sarkozy was held for questioning in Paris on Tuesday over allegations he received millions of euros towards his 2007 election campaign from the late Libyan dictator Moamer Kadhafi.
Sarkozy has already been charged in two other cases. Here is a summary of the various affairs involving the ex-president directly or people close to him:
2007 Libya funding
Since 2013, investigating magistrates have been examining allegations that Kadhafi's regime helped finance Sarkozy's 2007 campaign.
Sarkozy says the claims are ridiculous and is suing Mediapart, the website which first reported that Kadhafi had agreed to support him with up to 50 million euros.
This also relates to allegations that Sarkozy's then-UMP party accepted illicit payments for the 2007 campaign, this time from L'Oreal heiress Liliane Bettencourt in the form of cash-filled envelopes.
After a lengthy investigation which he claimed was politically motivated, Sarkozy was personally cleared last year of taking advantage of the elderly woman while she was too frail to understand what she was doing.
But his campaign treasurer is one of 10 people awaiting trial in the case.
2012 election funding
Sarkozy has been charged over the illegal funding of his failed 2012 reelection bid which featured huge US-style stadium rallies.
His campaign overshot strict French campaign spending limits by more than 10 million euros through a system of fake invoices which were fraudulently passed off as party expenses.
Sarkozy has denied any knowledge of the alleged fraud.
In February 2017, a judge ordered that the case be brought to trial. Sarkozy and 13 other co-accused have appealed the decision to send the case to trial.
Sarkozy has been charged with corruption and influence peddling over an alleged attempt by his lawyer to get information from a judge who was investigating the Bettencourt allegations.
In recordings from a phone that had been secretly tapped, the lawyer discusses the possibility of giving a magistrate from a top appeals court, Gilbert Azibert, a juicy job in Monaco in return for information on the Bettencourt investigation.
Sarkozy has argued the fact the job never came through shows he is not guilty of anything, but investigators believe the deal fell through because the former president and his lawyer learned their phones were being tapped.
The Karachi affair
This long-running investigation involves two former Sarkozy aides who have been charged by judges probing alleged kickbacks on a Pakistani arms deal concluded when Sarkozy was budget minister.
A shell company was allegedly used to channel kickbacks to then prime minister Edouard Balladur's unsuccessful 1995 presidential bid, which Sarkozy helped run.
Sarkozy has been interviewed as a witness, not a suspect, while Balladur faces corruption charges.
Magistrates are also probing whether a 2002 Karachi bombing that killed 11 French engineers was revenge for the cancellation of bribes secretly promised to Pakistani officials.
Six people have been charged over a controversial 400-million-euro payout by the French state to tycoon Bernard Tapie in 2008.
Judges investigated whether the former Adidas owner received favourable treatment in the case as a reward for supporting Sarkozy in the 2007 election.
The case ensnared IMF chief Christine Lagarde, who was found guilty of "negligence" last year for authorising the Tapie payout when she was finance minister, through a private arbitration panel instead of a court.
Sarkozy has not been targeted personally.
Investigators have charged three former presidential aides for benefiting from contracts for opinion polling carried out during Sarkozy's 2007-12 term as president.
The probe was triggered by anti-graft organisation Anticor, which says the contracts were handed to political cronies without any tender process and public funds were used to carry out political party electoral research.
Sarkozy benefited from legal immunity in the case. The investigation concluded in May 2017.