The Paris prosecutor's office has dropped an investigation into a French writer's claim that Dominique Strauss-Kahn, the former head of the International Monetary Fund, tried to rape her for lack of sufficient evidence.<br /><br />The office said on Thursday that Strauss-Kahn admitted to sexual aggression against Tristane Banon and that evidence existed suggesting that a sexual assault had taken place, but that it was too late to prosecute.<br /><br />In France, charges of sexual assault carry a shorter statute of limitations than attempted rape.<br /><br />Banon alleges that Strauss-Kahn tried to rape her in 2003 during an interview for a book. Strauss-Kahn has denied the claim.<br /><br />Al Jazeera's Tim Friend reports from Paris.