Peaceful protesters stop police provocateurs from starting a riot at the Stop the SPP protests in Montebello Quebec. CEP President Dave Coles confronts men with rocks and sticks.

The CBC surprisingly appears to agree that they were agent provocateurs, if you read between the lines.

Maybe their senior editors were away on vacation or something. It is rare for the controlled media to take a look at allegations of police provocateuring.

UPDATE Quebec police admit they went undercover at Montebello protest
The press release says "Les policiers ont été repérés par les manifestants au moment où ils ont refusé de lancer des projectiles."

In english thats: "The police officers were located by the demonstrators when they refused to launch projectiles."

Now that version of events is very clearly contradicted by the video, which shows demonstrators telling the officers to put the rock down, not to launch it.

Infowars article
SPP Agent Provocateur Cops Caught Red Handed Attempting To Incite Violence
Boots give away undercover cops as real protesters expose criminality