One relevant example of the Canadian gov breaking the law and lying about it until they were caught was the 2007 Security and Prosperity Partnership protests in Montebello Quebec. In that case the government used agent provocateurs (provoking agents) who were dressed as protesters while initiating violence to paint the protesters in a bad light. The linked Wikipedia article lists several other examples. [0]

That said, I don't think the state was the responsible party for this attack.

[0] https://en.wikipedia.org/wiki/Agent_provocateur#Canada