[Loyolas Mattman]

You make a good point about the traffic. It's very possible that an unthinking or uprepared sniper could trap himself in one of D.C.'s infamous traffic jams. This person has studied the get-away routes to minimize the chance of that happening.

We're either dealing with someone very well-trained, someone of very high intelligence, or more ominously, both.

[muawiyah]

Or a cab driver who works in that area.