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Justice correspondent in our washington bureau. pete, tell us more, for people who are just joining us this afternoon, about the threat itself. this was an e-mail apparently, sent to at least some of the school board in los angeles. >> it appears that the e-mail was sent to the school superintendent in new york and in los angeles. we've haven't been able to see if it was sent to other cities. the authorities in l.a. seemed to indicate they thought there might be. in any event, it was purportedly from a writer who was identified as a student, didn't give a name, said that they were a student at...

You can see why new york city got a similar message and they reacted a different way. we saw the message mentioned pressure cooker bombs and backpack bombs and a group of attackers preparing to take out -- take an attack against schools in los angeles and in new york, and the message made a reference to a vulgar reference to a male body part. that's one reason why new york city police commissioner bill bratton reacted to this by declaring it to be a hoax. take a listen. >> we have been in contact with the los angeles police department, the department i'm very familiar with, and a school system...

Closer look at the bomber's widow. among the items taken from her home, dna samples. why? to compare them to female dna found on one of the bombs. meanwhile, the younger brother has a new lawyer. judy clarke, a death penalty expert that helps secure life sentences for high-profile clients like the unabomber and eric rudolph, who detonateded backpack bombs during the 1996 olympics. let's go over the investigation with cnn's juliette kayyem. let's begin with something i haven't mentioned yet to close the door on this the miranda issue, circling through politics, about what was done wrong, are yo...

>> steve: with what happened last monday, backpack bombs, this is one of your biggest fears, isn't it? >> true. we're concerned about that. this is something that's very, very difficult to stop. >> steve: every third person on the street has a backpack. >> it seems that way, right. it's an issue, certainly at major events. certain events where it's a limited space, you can check backpacks. on new year's eve, we do that in a very controlled environment. but in a marathon, we have 26 miles. >> brian: it's impossible, isn't it? >> steve: everybody has one. >> brian: but you can secure the finish ...

Robert rudolph captured after years on the run in may of '03. 9/11, usama bin laden you mentioned his name almost instantly. 3,000 people dying in attacks on the new york and pentagon and on the hijacked flight in pennsylvania. bin laden first denying involvement and then in 2004 claiming responsibility. the mastermind, khalid sheikh mohammed captured in pakistan in march 2003. 10 backpack bombs exploding on four rush hour commuter traipse in madrid. this was march 11th, 04. 191 people were killed. 1800 were injured. at first the bask separate activity group eta is blamed. then investigators f...