A total of 26 people have been injured, including 20 police officers, after violence broke out in Paris during street protests against controversial French labour reforms.
Police official Johanna Primevert added that some 21 people were detained during the demo, which saw protesters throw projectiles at police officers who responded with tear gas.
Tens of thousands of people attended the demonstrations against the proposed law to loosen employment rules.
Seven unions and student organisations planned the protests.
Demonstrators set out from south-east Paris heading for the Invalides plaza.
Street protests also took place in other parts of France, while rail workers and taxi drivers were on strike.
In Paris, the Eiffel Tower was closed because the operators said they could not guarantee public safety, while taxi drivers temporarily blocked some of the city's main access roads in the morning.
In a separate protest, Air France pilots were striking to demand better working conditions. About 20% of all Air France's flights were cancelled, according to the company.
At the Eiffel Tower, an electronic board was indicating: "Monument closed - National strike".