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Mother. early tests show a letter sent to a republican senator from mississippi did contain a lethal biological agent. but more tests need to be done to confirm it was, indeed, ricin. the letter was addressed to senator roger wicker but it was intercepted before it reached his office. authorities say it had a memphis post mark but they don't know yet who sent it. wicker is now getting extra security. still ahead we'll go back to boston, just released pictures of a bomb device could help investigators determine how the marathon explosives were made, and perhaps who made them.

We know that about 17,000 runners had already crossed the finish line on boylston street, another 6,000 headed that way when the first big bomb went off just short of the finish line. and about two football fields away, 12 seconds later the second bomb went off. obviously those sites, tom, are critical to investigators in terms of physical evidence. what are they looking at right now. >> tom, the first thing they want to do is recover as much of the bomb device as they can, to help identify who may have made it, how it was constructed, and get an idea whether right there it would help focus wh...

It, and just a major tragedy. >> i hate to sound so callous, but i assume these trauma surgeons are trained to take any shrapnel and save it? >> yeah. >> and not discard it as they drive to save lives and limbs? they are taught 20 save it knowing there are signatures or finger prints on it? >> not usually. they will send them down to pathology to be put in formaldehyde. but in this situation there are police officers at every one of those hospitals sitting there to collect anything that's removed at surgery. so it's the police job to tell the doctors to save it and not just put it in a formald...

Saw something, they'll be taking whatever materials from the field that might be part of a bomb device together with materials from surgeries tomorrow. and from first thing they'd do is identify bodies and take x rays of the dedeedent dedeedents -- deseedents and removing them, bringing that over to the crime lab. they're going to have -- they don't have to have the whole wirks only a little bit of wire, only from a little bit they can tell whot manufacture was, where waits sold in boston. they'll be finding a treasure trove of material in those fragments and a agree. they're now -- security c...

How the bomb was made, who made it, and just a major tragedy. >> i hate to sound so callous, but i assume these trauma surgeons are trained to take any shrapnel and save it? >> yeah. >> and not discard it as they drive to save lives and limbs? they are taught 20 save it knowing there are signatures or finger prints on it? >> not usually. they will send them down to pathology to be put in formaldehyde. but in this situation there are police officers at every one of those hospitals sitting there to collect anything that's removed at surgery. so it's the police job to tell the doctors to save it ...