France, Oct. 31 -- "Demonstrations will be allowed, but not in city centres, where there is a risk of public disorder," said Nuñez. "We will tolerate no excesses. If there are, there will be an extremely firm response."

The Interior Ministry ​said 410,000 people took part in marches on 24 October when authorities deployed 70,000 police officers throughout the country.

The same number will police the streets again on Saturday, Nuñez said.

Last week's deployment helped ​avert a repeat of the looting and vandalism that marred protests in several French cities on 17 October, causing damage to shops and public buildings estimated at several hundred million euros.

In Paris, police chiefs have announced a route for Satu...