The American actor, Robert De Niro, was arrested by the French vice squad at the Bristol Hotel in Paris yesterday and held for questioning in connection with an international prostitution ring.... ...Some 40 prostitutes were reportedly matched up with wealthy customers as far away as New York and the Arab Gulf states. Clients included men involved in arms sales and the jewellery business, and the prostitutes received between £600 and £2,400 per meeting, plus travel expenses.