is at a virtual state of siege. they are combing the floors to find the suspected assassin. >> the building on the sixth floor we found an area near a window that had partially been blocked off by boxes of books and also, the three spent shells that had apparently been fired from a rifle. >> climb lab lieutenant j.c. dade just came out of that building with a british 303 rifle. >> it was a 7.65 mauzer. >> a high powered army or japanese rifle of .25 caliber. >> a 30/30 rifle. >> much of the first things you hear will be wrong, and to some degree you are consciously trying to separate out what seems to be a fact. >> in dallas, a dallas policeman just a short while ago was shot. and killed while chasing a suspect. >> j.d. tippet, a good experience ed police officer wa