French investigators have questioned one of Dominique Strauss-Kahn's daughters about an allegation that he attempted to rape a French writer.
Camille Strauss-Kahn is a friend of the alleged victim, Tristane Banon, the BBC reports.
Ms Banon says the former International Monetary Fund chief assaulted her in a Paris flat in 2003 as she attempted to conduct an interview with him.
Separately, Mr Strauss-Kahn denies charges of sexually assaulting a New York hotel maid in May.
Mr Strauss-Kahn was freed from house arrest in the United States city earlier this month after the credibility of his accuser's evidence came into question.
