I could add to that. I don't have it in front of me, but there are some security measures that may not be actually obvious to people when they pass by. For example, there are video cameras on the site that are being monitored, so that if inappropriate behaviour is seen at the site, police can be called immediately. Also there are other informal patrols by security or what have you. No, you don't see the presence on the site, but there are actually video cameras running.
On February 11th, 2009. See this statement in context.