Two people are expected to face charges for assault with a weapon against a police officer, and two others are expected to be charged for assaulting a police officer.
One demonstrator and one police officer were treated for non-life-threatening injuries.
Small group smashes patrol car windows
Thousands of peopled turned out Tuesday evening to march against the Quebec government's austerity measures.
The protest started at Parc Émilie-Gamelin at about 9 p.m. ET and the demonstration was quickly declared illegal under municipal bylaw P-6, because demonstrators did not provide police with an itinerary.
By 10:45 p.m. ET, police had ordered demonstrators to disperse.
While most protesters were relatively peaceful, a small group of people caused trouble.
Some people dressed all in black broke the windows of two patrol cars and tossed paint.
A few storefront windows were also smashed.
By 1 a.m. ET the streets had mostly emptied.
The event was organized by an anti-capitalist group called Mouvement étudiant révolutionnaire.
ALSO ON HUFFPOST: