revealing scenes of terror with some images too gruesome to show. i need a tourniquet. tourniquet. she s bleeding really bad. reporter: legs shattered by shrapnel from the pressure cooker bomb. bloodstaining the pavement. in court some of those victims testify about the blast. sydney cork ran, then a high school senior told the jury she could feel a tingling in her body. i was getting increasingly cold she said. i knew i was dying. her main artery had been severed. her mother lost both legs in the blast. besides the violence of the explosions these new videos show people rushing to help the injured. this was the scene inside mauer a thonn sports a running store located at the finish line. the blast shatters windows showing confusion in the store. you see people running out. some bombing victims stagger inside and clothing is gathered off the store shelves to make turn any kets to save so many
hoping jurors will now focus on the influence his brother had, to carry out the senseless attack. and spare dzokhar the death penalty. jurors saw four never before seen videos of the bombings. bloody bodies laying on the ground. first responders scrambling and the shock and dismay of onlookers, these videos shown in court yesterday during the trial. images that make an impact. i can move. i m with her. this point of view video on the ground level revealing scenes of terror, with some images too gruesome to show. tourniquet tourniquet. legs shattered by shrapnel from the pressure cooker bomb lay on the ground. their blood staining the pavement. in court some of those victims testify about the blast. sydney corcoran a high school senior told the jury she could
bureau of alcohol, tobacco and firearms. it could be a simple device, but that s all you need, it s an anti-personnel device, and that s all you need. reporter: the pressure cooker bomb is not knew, there s plans for it on the internet. the failed terrorist who tried to blow up times square in 2010 tried a variation on the idea but it didn t work and pressure cooker style bombs are a common form of ied use inside both afghanistan and iraq, made famous by this english language article in an al qaeda terrorist magazine known as inspire. this doesn t necessarily mean that is jihadist or al qaeda inspired, but it s striking that there are close parallels between the description of the devices in boston and this
to be used either by islamic radicals or domestic terrorists. so it s much harder to determine, okay. this looks like al qaeda or it looks like somebody else because the recipe and the equipment is so readily available if you want to try and google it on the internet. and they re not all that complicated, difficult to make. fran townsend you re our homeland security analyst. you worked as the homeland security adviser to president bush. this pressure cooker type of bomb, i ve been told that they are fairly, pretty evident in afghanistan, pakistan, maybe in iraq and not all that complicated to develop and certainly as gloria said you can go on the internet and get the instructions how to build them. that s right, wolf. the component pieces are readily available. it s easy to buy a pressure cooker. the circuitry to put it up
is it looking for a needle in a hay stack. the forensic scientist from john jay college of criminal justice. thank you for taking the time. i wanted to show you a few of the pictures we now know law enforcement are looking at carefully and just get your view on these. first, the before and after snapshot from whgh basically showing, as you can see, before there s a nylon light colored bag next to a mailbox and then after it s gone, the picture we have blurred there because of the graphic human nature of the content. when you look at that picture, what do you see? well, i think we already know the seat of the explosion. it becomes very important to try to focus in on the exact spot and how the bomb was delivered, how is it disguised? how is it dropped? where was it dropped? and then ultimately to find who dropped it. but looking at these kinds of photos help us focus our