An anti-austerity protest in downtown Montreal ended last night with clashes between police officers and some demonstrators.

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.

police officer smoke bomb montreal protest

Police officers use chemical irritants to disperse crowds of protesters after several clashes. (CBC)

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. 

student protest montreal roman candle

A protester sets off a Roman Candle firework as police trail the demonstration through downtown Montreal. (CBC)

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.