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Something very specific from katie russel's home? >> yes, erin, we saw fbi going in with evidence-gathering equipment. that included a black case that one of these investigators was hugging against her chest when she came out. there was also a clear, plastic sillen dar that looked like a two-liter soda bottle. but this plastic bag that looked like dna samples. dna samples was very clearly written on that bag, erin. >> obviously, everyone is going to be asking a lot of questions about what the significance of that could be in light of our reporting on the dna and the bomb. we know that katie ru...

Could have prevented the attack and at what cost to america's privacy and freedom. but i want to go to boston first and susan with this breaking news. >> by finding that female dna on one of the pressure cookers, it certainly helps move forward this investigation. we know that investigators have been looking for any kind of evidence on the remains of the pressure cooker bombs. looking for hair samples, for any dna samples, for finger prints, for example. now we know it has tested positive for dna. we also know that the fbi retrieved a dna sample from tamerlan tsarnaev's widow, catherine russ...

The mysterious man is found and speaks. let's go out front. investigators have found female dna on at least one of the bombs used in the attacks. what exactly does that mean? we're going to get right to that along with all the other angles of the story tonight in boston. susan candiotti with the latest on the investigation and what the fbi found at tamerlan's wife's investigation today. a possible link between tamerlan tsarnaev and a known jihadist and a look at how authorities

So it may well not implicate anyone of anything. it could have ended up on a battery. there was a battery there, a remote control there. obviously, as far as we can tell, there was certainly something on the pressure cooker. there were probably a lot of handlers in the chains of commerce as all these products went to market. it's not to speculate. all we know is that they have dna. they're not sure what it means and it belongs to a female. erin? >> joe johns, thank you very much. as we get ready to go to deb feyerick, forensic expert a few moments ago told me there's a big difference between s...

Better word, would you be able to say this dna was around from someone likely around during the building process as opposed to the victim? >> no, erin, you raise a good point. dna could have been from one of the vick tills. wu, again, we're talking about a comparative science. and we're talking about the source of that dna on the bomb. you need to compare it with something. you need to have some other profile to make that come parson. but it is certainly possible that it came from one of the victims, as well. you have to interpret what we say. >> now, if the dna ends up being her dna, how do t...