Funny you should mention that...
Police accused of using provocateurs at summit
OTTAWA – Protesters are accusing police of using undercover agents to provoke violent confrontations at the North American leaders' summit in Montebello, Que.
Such accusations have been made before after similar demonstrations but this time the alleged "agents provocateurs" have been caught on camera.
A video, posted on YouTube, shows three young men, their faces masked by bandannas, mingling Monday with protesters in front of a line of police in riot gear. At least one of the masked men is holding a rock in his hand.
The video can be found here, among other places.
What I really love is that once again it's the bloggers and the 'citizen journalists' who brought this story to the fore - otherwise it would have been completely missed by the mainstream media.