Shots Fired At Pentagon

Around 5AM this morning someone fired up to five shots from a rifle at the Pentagon. Two shots were known to hit the building but did not penetrate. A search of the area didn't turn up any suspects. If that was me, and I worked at the Pentagon, I would be very concerned. If someone can hit it with a rifle and not be detected what's to say they can't hit it with something stronger. Let's hope we learn from this.