PARIS, June 2 (Reuters) - The French prosecutor's office onTuesday demanded that a one-billion-euro bail be slapped on HSBCHoldings to cover a potential fine after the bank wasput under formal investigation over allegations it helpedcustomers dodge tax, a judicial source said.
HSBC's appeal against the bail - which magistrates want to bepaid before June 20 - was examined by the Paris appeal's courton Monday, the source added.
HSBC Holdings was placed under formal investigation inApril.
(Reporting by Chine Labbe, writing by Astrid Wendlandt, editingby Mark John)