is in a virtual state of siege. they are combing the floors of the texas book depository building in an effort to find the suspected assassin. >> in the building on the sixth floor we found an area near a window partially blocked off by boxes of books and also the shells fired from a rifle. >> lieutenant j.c. day just came out of that building with a british 303 rifle. >> it was a 7.65 mauzer. >> high powered army or japanese rifle of 25 caliber. >> a 30/30 rifle. >> much of the first things you hear are going to be wrong. and to some degree, you are constantly trying to separate out what seemed to be a fact. >> in dallas a dallas policeman a short while ago was shot and killed while chasing a suspect. >> j.d. tippet a good,