NEW : Fuel supply from refineries to Paris alone is back on . Tens of thousands protest in Paris alone , police say . The strikes have also led to a reduction in train services throughout France . Demonstrators oppose the government lowering retirement age . Other fears arise as refinery workers call strikes .
NEW : Fuel supply from refineries to Paris alone is back on . Tens of thousands protest in Paris alone , police say . Demonstrators oppose the government lowering retirement age . Other fears arise as refinery workers call strikes .