( dpa ) - The rogue trader alleged to have cost French Bank Societe General 4.9 billion euros (7.1 billion dollars) was taken into police custody and questioned on Saturday, media reports said.
According to French news agency AFP, 31-year-old Jerome Kerviel had arrived at the headquarters of the Paris police's financial brigade around 2 pm (1300 GMT).
Police on Friday had searched Kerviel's flat in the elegant Paris suburb of Neuilly-Sur-Seine as well as the Paris headquarters of the bank.
The bank, meanwhile, has filed complaints against Kerviel, who began working for Societe Generale in 2000, for bank forgery and the use of forged documents.
The web site of the daily Le Figaro reported Friday that, according to material in the hands of the public prosecutor of the Paris suburb of Nanterre, Kerviel allegedly began his scam in February 2007 and worked it until the middle of January 2008.
However, analysts in France and abroad were skeptical that a single trader, no matter how clever, could have carried out such a complex scheme for such a, long period of time without an accomplice or the tacit agreement of the bank's management.
Some analysts have suggested that the bank gave Kerviel a free hand in the hope he would be able to make up for losses it suffered because of the US subprime crisis.