of evidence how the bomb was made but they don't have a lot of evidence about who did this or why. the actual evidence that would lead to the person or persons involved. >> this suggests a slightly higher level of them what was first thought yesterday and if so, does that narrow down the net of potential suspects? >> it does. the black powder, the acetone, peroxide, you don't want to let it get went. absolutely right. you want to protect the explosives, the detonator. when this bomb went off, talked to a couple of people and their first reaction was what is happening to people coming back from afghanistan? they are terrified that american soldiers with four or five to worse will come back and be