The husband of a 29-year-old bank worker whose partially-burnt body was found last October in countryside near their home in Gray, north-east France, has been detained for questioning by police who until now have found no other suspects for her murder by strangulation.
The November Paris attacks fugitive, arrested in Brussels on Friday, told Belgian police he had 'wanted to blow himself up' at football match.
The four men appear to be the first to face judicial questioning in France since accusations were first made against French peacekeepers last year.
Bernard Tapie is being questioned over a 400-million-euro state payout he received in 2008 when Christine Lagarde was France's finance minister.
Former IMF chief and one-time presidential hopeful Dominique Strauss-Kahn is questioned over alleged links to sex-ring parties in France and US.