Nicolas Sarkozy, former French President has been taken into custody by police for questioning over allegation that he received campaign funding from the late Libyan leaders, Muammar Gaddafi.
Police are investigating alleged irregularities over the financing of his 2007 presidential campaign.
BBC reported that his former aide, Alexandre Djouhri, was also arrested in London recently.
Sarkozy failed in a bid to return to power in 2012.
Judicial sources said he was being questioned in Nanterre, a suburb in western Paris.
In 2013 France opened an investigation into allegations that his campaign had benefited from illicit funds from Gaddafi. Mr Sarkozy has denied wrongdoing.
The sources said one of Mr Sarkozy's former ministers and a close ally, Brice Hortefeux, was also being questioned by police on Tuesday.
The allegations came from a French-Lebanese businessman, Ziad Takieddine, and some former Gaddafi regime officials.