Footage of Montreal Police shooting a protester with chemical irritants at point-blank range, was posted online on Friday.
YouTube user Cunegonde Dufromage posted that the video was filmed at the Montreal Congress Centre, the site of today's protest.
The protests were aimed at Premier Jean Charest who was speaking at the Congress Centre. His speech was delayed by the demonstrations.
According to reports, the protest became violent, with objects being thrown and students making their way into the building before being forced out by police.
While some protesters hurled objects and built barricades in the street with construction materials they'd found, police fought them off — at one point firing chemical irritants right into one young man at nearly point-blank range.
According to reports, a number of police officers and protesters were injured and arrests were also made.
Although mostly peaceful, a number of violent incidents have marred the long-running student protests in Quebec. Earlier this week things turned violent, with incidents of broken windows and a police officer being hurt. More disturbingly, Molotov cocktails were thrown at the offices of four ministers this week. Premier Jean Charest brought up these incidents when he spoke about the protests.
"I've had ministers' offices ransacked. We've had ministers who have had tanks of gas put on the grounds of their homes. Molotov cocktails in front of their offices. Death threats.
"And they refuse to condemn violence? In 2012, in Quebec? That's unacceptable," he said.
Correction: An earlier version of the story said the protester was fired at with a tear-gas canister, this has been corrected to indicate it was chemical power irritant.