Between 550,000 and 800,000 people protest across France

Between 550,000 and 800,000 people protested across France on October 17.

The demonstrations took place nationwide, including in Paris and Marseille.

The reports do not say what the protests were about or who organized them.

France's interior minister said 400 people were arrested across the country.

Fires darkened the sky over Paris, while town halls and businesses were attacked in Marseille.

The violence raised questions about protest security, but no details are given about planned next steps.