Britons have been warned not to travel to many parts of France, amid fears of further violent protests against new employment laws.
Hundreds of people have been injured in the demonstrations
The UK Foreign Office urged travellers find out where demonstrations were planned, and to stay away from them.
The government also said travel plans may be disrupted by a day of mass strikes due to take place next Tuesday.
Some 1,420 people have been arrested in protests across Paris and many of France's major cities since 11 March.
The Foreign Office warned that protests were continuing in central Paris, some of the city's suburbs and in other French cities.
"You are advised to check the latest position with your operator and to avoid any areas where demonstrations are planned or taking place," the department's travel advice stated.
Students have been infuriated by government plans to make it easier for employers to hire and fire young workers.
French ministers say the reforms will reduce unemployment among less privileged youths by making the labour market more flexible.