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Ms. Diallo is continuing to press her claims in a lawsuit. Mr. Strauss-Kahn denies the allegations.

Mr. Strauss-Kahn faces another investigation in France based on accusations by French novelist Tristane Banon, who says he tried to rape her during an interview in 2003. He calls the claim “imaginary.”

Ms. Banon’s mother, Anne Mansouret, told the AP that Mr. Strauss-Kahn’s return “is a good thing for my daughter’s complaint because he will have to answer to police.”

Ms. Banon has said she didn’t file a complaint after the incident because her mother, a regional Socialist official, urged her not to.

Ms. Mansouret, who now says she regrets that decision, called it “profoundly indecent” that Mr. Strauss-Kahn’s homecoming Sunday was like that of a “star.”

The AP does not name people who report being sexually assaulted unless they agree to be identified or come forward publicly, as Ms. Diallo and Ms. Banon have done.

Mr. Strauss-Kahn, known in France by his initials, DSK, is also dubbed a “great seducer” by French commentators for his reputation for sexual adventures.

That reputation — and France’s overall attitude toward keeping politicians’ private lives private — came under scrutiny after Mr. Strauss-Kahn’s arrest. Many called for more openness about questionable private behavior that might reflect on a politician’s public life.

The Socialist Party is now in a fierce campaign for primaries next month to choose its candidate for April and May presidential elections. The front-runners, while relieved that the New York case was dropped, do not appear keen for Mr. Strauss-Kahn to make a comeback.

Mr. Strauss-Kahn, an eloquent economist and former finance minister, still has many fans in France, and there remains a small chance he could play a role in the presidential campaign. Mr. Strauss-Kahn himself has remained silent about his political plans.

In welcoming Mr. Strauss-Kahn back Sunday, many French people expressed concern for his wife — who was more famous in France than her husband before they married 20 years ago — and what she’s been through in recent months.

One supporter belted out an ode to Mr. Strauss-Kahn in a performance at Charles de Gaulle Airport on Sunday morning, accompanied by a Verdi opera played on a portable stereo, before police officers asked him to stop.

“Dominique! Dominique!” shouted Gregoire Vandevelde, who said he was a former student of Mr. Strauss-Kahn’s at a prestigious economic institute. “He is extremely brilliant, full of humor and very competent, warm with his students,” Mr. Vandevelde said.

Angela Charlton in Paris; Catherine Gaschka in Sarcelles, France; and Ted Shaffrey and Jennifer Peltz in New York contributed to this report.