(PARIS) — Yellow vest demonstrators gathered in Paris and other French cities for a 19th round of demonstrations as authorities issued bans on protests in certain areas and enhanced security measures in an effort to avoid a repeat of last week’s riots in the capital. Authorities banned protests Saturday from the Champs-Elysees avenue in Paris and central neighborhoods of several cities including Bordeaux, Toulouse, Marseille and Nice in the south, and Rouen in western France. At noon (1100 GMT), hundreds of protesters gathered on the Denfert-Rochereau plaza, in southern Paris, from where they were planning to march toward tourist hotspot Montmartre in the north.