In February 1998, American actor Robert De Niro was arrested by the French vice squad at the Bristol Hotel in Paris for questioning in connection with an international prostitution ring.01 He was detained on a warrant by Judge Frederic N'Guyen, who had been investigating the prostitution ring since October 1996. De Niro was in Paris for the making of Ronin, an action film by the director John Frankenheimer, and was scheduled to remain until the end of March. The police had attempted to question him last Friday, but found he had already left the Bristol Hotel for the weekend.0