person? we don't know if it's a man or not. we keep saying gentleman or man, but we don't know. >> purely speculative, was there an anarchist, a jihadi, was there somebody that had a particular beef or something, disgruntled employee. we just don't know right now. >> one final question -- the final moments, how tenuous is that when you're the fbi, police, atf, moving in on a suspect who has been known to blow things up? a serial bomber. how difficult is it to approach that situation? >> extremely difficult, dave, because you don't know about boobytraps. somebody that had the skill set that this bomber had could have set a booby trap. the reports are that no other law enforcement or civilians were injured. >> thanks for being here. you had a busy few days. >> don't go far. eight minutes after the hour. the fourth nor'easter barreling up the east coast in three weeks. set to dump more in washington,