PARIS (Reuters) - French refinery workers cut off a fuel pipeline to Paris on Friday as protesters piled on pressure to derail President Nicolas Sarkozy's unpopular pension reform.

Police broke up blockades at fuel depots in southern France but protesters blocked a terminal at Paris's Orly airport and truckers were set to join the fray as momentum built for a day of street rallies on Saturday.
A nationwide strike is planned on Tuesday, a day before the Senate is due to vote on a bill to make people work longer for their pensions.
The protests have become the biggest challenge facing the centre-right president, who is struggling with rock-bottom popularity ratings as he tries to appease financial markets by stemming a ballooning pension shortfall.
Turnout among striking rail workers dropped to 15 percent on Friday, from 40 percent earlier in the week, but union leaders hope to galvanize the public for next week's action with the same force that saw a 1995 pension bill crushed by 24 days of protests. Next Tuesday's strike could hit various sectors.
""This movement is deeply anchored in the country,"" CGT union leader Bernard Thibault told LCI television.
""The government is betting on this movement deteriorating, even breaking down. I think we have the means to disappoint them.""
France's main trucking union called on truck drivers to join next Tuesday's strike, though they may not be able to use their bosses' trucks to block roads.
The best chance Sarkozy's opponents have of bringing down his pension bill is if strikes at oil refineries continue and start to threaten fuel supply, or if youths hit the streets en masse and set off violent scuffles.
A pipeline supplying fuel to the Paris region and its airports stopped operating on Friday because of strikes at northern refineries, a source at the company operating the pipeline said, and motorists across France stocked up on petrol as depot blockades squeezed supply.
----Flashball shots banned
TV footage showed riot police using teargas to contain young protesters in the southern city of Lyon and in Paris police officers got orders to stop using flashball riot control pellets to quieten crowds after a secondary school student was badly injured on Thursday.
Students at hundreds of schools across France joined the protest movement in force from Thursday, shouting anti-Sarkozy slogans. Dozens have been arrested and on Friday more were barred by riot police from nearing the prime minister's offices.
Polls show two-thirds of French people oppose Sarkozy's plan to raise the minimum retirement age to 62 from 60 and lift the age at which people can retire on a full pension to 67 from 65.
The government has been at loggerheads with unions for months over the issue and five rounds of strike action since the summer have badly disrupted public transport and air travel.
The strikes have had negligible impact on France's economy but have sparked worries among financial analysts about whether France will struggle to push through broader austerity measures necessary to bring down its deficit.
Photo: High school students face anti riot police during a demonstration on October 15 2010 in Lyon to protest against France's government pensions reform. France's main unions upped the ante in the fight against the reform meanwhile, calling for their members and supporters to hold the fifth in a series of strikes and street rallies on October 19. (Source: Getty Images)