After the protest , the police force initially denied , then later admitted that three of their officers disguised themselves as demonstrators ; they then denied that the officers were provoking the crowd and instigating violence . The police released a news release in French where they stated " en aucun temps , les policiers de la Sûreté du Québec ont agi comme agents provocateurs ou commis des actes criminels " and " à tout moment , ils ont répondu à leur mandat de maintenir l'ordre et la sécurité . " During the 2010 G20 Toronto summit , the Royal Canadian Mounted Police ( RCMP ) arrested five people , two of whom were members of the Toronto Police Service . City and provincial police , including the TPS , went on to arrest 900 people in the largest mass arrest in Canadian history . The RCMP watchdog commission saw no indication that RCMP undercover agents or event monitors acted inappropriately
2010 G20 Toronto summit
2010 G20 Toronto summit
Agent provocateur