I will try to give you a brief answer. At that time, there had been allegations that the police was misusing people's personal information at the border with the United States, that activists in Vancouver were under increased surveillance, and that there was a database on the activists, and so on. This was before the games. Nothing happened, but I remember that the atmosphere was fairly tense before the games.
On October 19th, 2010. See this statement in context.