Tristane Banon, a journalist and writer some 30 years his junior, says Strauss-Kahn assaulted her in 2003 in a Paris apartment where he had invited her to interview him for a book she was writing.
The former IMF chief, once seen as a favourite to challenge Nicolas Sarkozy for the French presidency, returned to France after US prosecutors dropped charges last month that he tried to rape a hotel maid.
He was questioned by Paris police for about three hours before leaving the station around 0900 (GMT) in a car without making any comment to journalists.
His French lawyers said in a statement that Strauss-Kahn, who has yet to make any public comment since returning to his Paris home, had asked to be heard by police as soon as scheduling allowed.
Witnesses
Other high profile witnesses, including Socialist presidential candidate Francois Hollande, have been questioned by police in the case to determine whether they had any knowledge of Banon’s allegations.
One issue is whether her allegations against Strauss-Kahn amount to attempted rape or sexual assault. In France the statute of limitations for sexual assault cases is three years, versus 10 years for attempted rape.
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