A few years ago I had the privilege of taking an after hour tour of the Capitol building. Underneath the seats of every representative is a small plastic case filled with stuff needed in case of a chemical attack. I am sure that members of Congress are given briefings on what to do in case the Capitol is attacked.
But they also know that Americans are willing to give up their lives to save them from harm.
Too bad the resident of the White House does not share that sensibility.
They were using cell phones to call loved ones, and when the word came across to them that two hijacked planes crashed into the WTC it was pretty obvious that the hijackers weren't planning on taking the plane to Cuba and letting them all go.