From my office, I have a good view of the entrance to the Citigroup building. Trucks from the various media are parked in a row along Lexington Avenue between 52d and 53d Streets. Each I suppose is hoping to grab the exclusive: "Bob, I am standing here with a live exclusive of one of the terrorists hoping to blow himself up." The story line for today is more likely "No terrorists today, people go to work."
Which leads me to my main point. Security is checking the bags of everyone entering the Citigroup building. This has created an extremely long line of people waiting to get in, and crowds of people congregating on the street.
The intelligence is that the terrorists intend(ed) to use car or truck bombs. Searching people as they enter the building will not prevent such a tactic, nor lead to the "discovery" the "terrorist in the midst." Instead (assuming the legitimacy of the threat reports) it simply increases the number of potential victims because now there are several hundred people standing in close proximity outside the building.
And, if that were not enough, the police have not erected any concrete barricades--the type that are normally set up to prevent, I don't know, trucks or cars containing explosives from getting near a sensitive site.
In all, the "security" operation being conducted (at least to the naked eye) is theater for the assembled media.