Thank you for the question.
Attribution is a big problem because it isn't easy to trace the source. These groups of attackers, even if they are identified and even if we manage to find out who they are, rarely claim responsibility for their actions. When they do, they try to provoke. When they decide to claim responsibility for their actions, they expect a reaction. In terms of the attack on Rideau Hall, they won't claim responsibility, but they leave enough doubt that it is assumed to have come from there. We have to be careful when it comes to this type of attack.