Organizers formed an Integrated Security Unit , consisting of police officers from several regional departments , to provide security during the summit in Downtown Toronto . The event was part of the largest and most expensive security operation in Canadian history . The total combined cost between the 36th G8 summit in Huntsville and the G20 summit in Toronto including security , infrastructure , and hospitality , was determined to be approximately C$ 858 million
36th G8 summit
36th G8 summit
2010 G20 Toronto summit