From the CBC…

“Quebec police admit they went undercover at Montebello protest

Quebec provincial police admitted Thursday that their officers disguised themselves as demonstrators during the protests at the North American leaders summit in Montebello, Que.

The police came under fire Wednesday when protesters accused the force of planting undercover officers in the demonstration to provoke violence. A video surfaced on YouTube that appeared to depict disguised police in the crowd.

The provincial police, in a news release, said its officers went undercover to identify and stop non-peaceful protesters.

“In no time did the police of the Sûreté du Québec act as instigators or commit criminal acts,” the news release states in French.”

Then what were the rocks in their hands for exactly? Were they planning on building a wall? The video shows them holding rocks clearly enough…

Of course, during that segment of the video you can clearly hear Dave Coles yelling - “put the rock down man!”